Physics Unit23: Light and Geometric Optics - 51fly国际课程 (51fly.win)

1#

Reflection, refraction, and the formation of images by mirrors and lenses ha 2 )n9nce99u mlgk8ggihceo1/qo6 m5 zs been successful descri 9uo6eoqick 851 9l/gghncme )9mzg2nbed by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidencedgji ep/k h9e3-/y ur)

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirn2eza42a kfei2w-.sm rors work is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an ima+:ho3s/97:f soxdgp xhaz-znm*7i o age that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce i q3s(n o4e b8bwnl6v.images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actu;si x -wtka*t1ally pass through the image location, and would not appear on paper or film placed at thikts;axw*-t 1 at location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through the image location,3yw;wi iq)2scly z7m3 and could appear l 7wisq32wyz;y3i)cm on paper or film placed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a jww 7qdl*-fwivj+q10-izn 0nyky +h8virtual image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surface of th5klnr l8+jm4dka 76ip e spherical shape is referred to as ajmkp l6 rk id+4l785na

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on 5pu, 7(rlb: mkdfkd*g the inner surface of the sphere is referred k*l bf,:dp7 kmrd 5gu(to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the concave mirror is rsv:)9 z2um tvpp (luag+1 k+lf, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to yax:.xk5lid7 a concave mirror's axis, strikes the mirror's surface near its midpodlxi 7y:k x5.aint. After reflection, this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to the axis isk0een+l:l;wk60 e6 igo:cr 6lviptgoq )9ki+ reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's axis, crossoh a(,jef,dxeh 04h6mes the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, thiae,dxh 4,ojm(feh06 hs ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through thev05ih z9htu t-ijjm9, center of curvature is reflhhi9, z 5t9t jv-jiu0mected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's she ..l 4nrvgfd+b+z3r urface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, this lb ev3 .n+gh.+d4 frzrray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concr,1wv vh :*3uvv u8a-pkgl5hua2u(yzave mirror on a path through the focal point is reflected3*vu2pvwu-g (5:hahu r a 8,lkvy1uzv

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays 7bacqdg 2n8.ffor finding the image position due to a curved anbd.7 cq 8f2gmirror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly at its focal point8qak5*y bs8 it,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image, and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's center of curvaqxw5nr cy/0ln(ukqk:r 7uqnk6 : hu/2ture. The image produc6( 2xuh/7:nlkyucnq nkru:wqr5q/0k ed by the mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned betr*g)pq86ss ttween a concave mirror's center of curvature and its focal point. The image producedsp6 8 tr*tqg)s by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface and its focal point .d 3yom 9uq6k0kozsn3. The image formed in this coq syk o6u39.znd0mk 3ase is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in fron3 xgh s*/zk1jm y 5ygy9bki iqkg,7*1xt of a convex mirror, at the same distance from it as its radius ojkiy,g7 9hq3gmg5*yi x11 zxs/k kby* f curvature,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the s7 zs 7s8dy4lw *e.eohpame distance from it as its focal le z 87ohsw*4e7.lp ydsength,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mirror you see a magnified image (a g 164st ,o dxq:vkka+ bvn4m+md v07cjgreat big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side ofv+d o:qav,7kmkc01b 4n+j46 tx sd gmv a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrors produce mc8k6ohh u6(a5nr :po images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors-l mqq.ag rre) (rz:a: produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror prd s-g2h86csgnp rj9 )noduces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an image g4wuq)mf0vxa9 mbj- / which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for 6jxut)e(l ynp/bm.j4 a mirror means

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, thh- umw,bbl:xd- m31 +pn(ndoie image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negative, the/n-m 3,jgtgzc cf(.9abi 1urn image formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a posyc3 ybdms(a 91: pvpja-z2chzwv /- n7itive value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative value, the image f/ ac14)r attais

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is larger than one, t z)3epa k26wrrhen the image is2e war)kz6r p3

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of*:h,6guzxpb6zxs) s t mimc.4 the magnification is smaller than one, then the image i :bx6.c p6m u*x hzig,z)tssm4s

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal to one, then the imag95/g wdf pt p/1pthxdu(h 44ywe is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastesrx/b gib.t- s:0ygm s/t

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index of refractionp, w 4woyzn2u9au:jq)n7h pj (

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction lesdp1 89q ; wcjrc4:agca (lh*tas than one for a medium would imply

A. that the speed of light in the medium is the same as the speed of light in vacuum.

B. that the speed of light in the medium is greater than the speed of light in vacuum.

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of di12ig h)6vi hfyamond is $2.42$. This means that a given frequency of light travels

A. 2.42 times faster in air than it does in diamond.

B. 2.42 times faster in diamond than it does in air.

C. 2.42 times faster in vacuum than it does in diamond.

D. 2.42 times faster in diamond than it does in vacuum.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidenpdodq 3l5gw+*qje g jn1f 4;nhp25(gg ce

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into afdh :of+fz9q6 u0n fy* tcr(x/ denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refrs,r d;4.f6pgvg s-xry/ vf6 elaction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is trave6y8ar7irb7pv cfwch* ec : s( :mbw(g/ling in air, is incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber h+w 1yzl gbs*k2 -nxw6(ltl-aoptics is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing from water into)7e8 y;xxnfzdij 7ow 3gj0+gh air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses lc6gz;fv. 1eywork is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest o,d/--a n0ok l-uuz d;*cqjb37nvijr at the center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than the edabhbq4mf*0- i6l5 th3qxx 5ol ges are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker 2df o)dggugskrw422 a .u n)togcx825at the center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens B is rated ax d l-y0qc zn;s,wgk2 5u6uwui/g 3r7ut 20 diopters, whereas lens A is rated at 10 diopters. The focal l 7; gugk-dwzcrlw,0 u2 y/x5inqu 63suength of lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of g(91cftviqr6d42q7x :epf pah 99 fkql+mae7 a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely tt q1fc+e9d2 7i(9e ka ah:9mx7qp 4flgfr 6vqpo the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to tu m79 )z bbd8t.4.ja(tspt (au9hcv6b i 4hayahe axis of a convex thin lens, strikes the lens near its midpoint. Afte7bjtu )4bay.v a (s b(9tdch 4az8h9iaptu.6mr traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three r-g vi8 u(m46m9tsdval,df)nsays for finding the image position due to a thin lens.(ls9uf,4vt mg8 vnda- dm)i 6s

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has focal lent6lee) 8ho6xigth $f$. An object is located at infinity. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a f x9 *krh)m. j,ntxov8s/3gr cfocal length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focah; l shy+rje(8l length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a foc* rj/ir8mjy 6yoj4is: al length $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal len b)ld n4)7npxhh1upm ,q5ok+i gth $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex lens and its focal point. 8g /cm3gg0.mik ljxj0uz+ke, The image formed /+kjjel3c.x,gk0g u 0mgi8m zis

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave lenses y1ivw1b +cfb0

A. are always real.

B. are always virtual.

C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.

D. could be real or virtual, but always real when the object is placed at the focal point.

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare stamp you see through a magnifyp c.*kfqrpt 7f +7 55yjlollugzl-f ,+ing glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screq4w8e)q zl.wny-lk3u4xe j) qen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imagexwlq kn3je4 - yqe )w8l.z4uq)d on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of fa8p86elxxb j*3h5y jrm7bc c*ocal lengths $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convcb;5-m b s02m vwg,vwiex) lenses are placed in contact. If each has a focal length of 20 cm, how would you expect the combicw wv25vb ; g0mbs-,imnation to function?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an angl f,bax35gmebi*vf20 se of incidence of 03,emxbs* af igvb52f$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of a plane mirror.73jv:,iw/45vmyltvcz3 me wy The image formed by the mirror appears to be /cem5:z7ym3 v43wytvij v,lw

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75 m in front of a vertical1tg.ncay; rp)bxn b26 plane mirro;y tpagnrb1xc2 .)nb 6r?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach your image when you approach a vertical ibo3, udkbv;0*t ;vlkplane mirror at a speed of 2 m/s? klbt u ,d0ibvv3k*;o;

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radiuc5 ;byjufmmy.+ ,r 1uss of curvature of 20 cm. How far from the mirror is the focal point locatedymb. ;ury sm+cu1f5j,?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creates a real image 3ue 8 8n kgm:;ywzdva+*u;a1f s0 cm from the mirr;1z8dm *u vyaeg+8 sa:uwn;fkor. What is the object distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirrob;/* 1g; dx3woxlnf- ,mjpmqfr, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirj;bw-o ndm; ,l*mfx/3gqfxp 1ror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concaven+yym ovw d)vnf2) m+( mirror with focal length 3 cm. Where is t n+nvw2+mydy )( o)mvfhe image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of wa;4tx6+i/ (zp wgbm)iuj4 hmf cok3/20 cm. An object is placed 10 cm in front of the mb mg;+)zhtmi 4p/ajw ukxo/wf(i 3c46irror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An )-al v0wzqc1 gobject is placed 30 cm in front o)vl qg 1-cw0azf the mirror on the mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. t)ogaelb( 05 df hrw 5d8:2vtwThe image is 4.7 cm tall, and 10 cm from the mirror. hef)w5l0dv2 dt g8at 5: br(owHow tall is the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirjq)6lo;*aqnnsq0v-v 3 tt 0j sror of focal length 20 cm. The object is 4.0 cm tall. How tall isanv qsq;0t nj30jq*vsl6-ot) the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tall, a07c z;r9bfzeqzrzht h ((d ;4lnd 14.8 cm from the mirror. Hzz(e0l94qtr rhfz bz ;h;(d7cow far is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. hiv, p) wu+p)z/v p*g r/)qqdk If the image is 4.0 cm tall, howu qr)/hd *)ip+vpqv ,)wpk/zg far is it from the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of foctnl*z679.)lpa9r(7zfm vggsp.avql q a2-tnal length 20 cm. The object is 4.0 cm tall. Where is the imagtgl9 6zpv.7. v9alg)mrzanfq2an7l * q(-pste located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 xa4 0d jy *2v 0q+ff9b6oi65xakmveyi cm in front of a cosmetic mirror (concave mirror), the erect image is twice the size of the object. What is the focalq 6d6i2 y+vaxfxe 95 o*0m 0jk4ayvibf length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a concave shaving mirror. If the image is :+ekogqh.s)a an erect i aqh. +eks:og)mage 1.5 times as large as the object, what is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a con+ m :pijsm:;micave mirror with focal length 5.0 cm. Where is the objectip+immm:s :j; ?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object is pla 5;kh2tm vpw y/).hiwhced 10 cm in front of the miry2/t5km) w;w.hiv hphror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object is plalr6/kbl ycn+e s d17;yauay99ced 30 cm in front of the mirror on the mir/+nk a1 6e9b7 u;sy ldrlcy9yaror's axis. Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in ,vaav3zps gcys18qbz4) c.; rfront of a convex mirror. The image is 5.8 cm behind the mirror.)a .vyrcvzb1za3ssg; c8p, q4 What is the focal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm tall, and 14.8 cm from a con 6vvgrqlz3n (+oxi:ig;(fti(vex mgi(;q ( zvo+6frxn liv(ig3: tirror. What is the mirror's focal length?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, what is the speed ofrdsm1 azif**dxb, .t fb*33ce light throm 33fdx*s rfb.*za 1icd be,t*ugh it?

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass intog6kad zfv;r o62d qkvr.y+o 6zo*;q ,erface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance fr nc891dlxaik dsmp3 3py*ka:sj8 6c1l om air at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming ray is at an angl9fqf:0enx5 wje of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly znv c,(awg*bm0 gqxoq6q u7 5*and evenly over the surface of water on a windless day. What is the angle of refractionqwq5 oc, x*0a 7q*mu(nzgbgv6 in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneat7rca8p9kt8 d 0 tadl668jzzbvh the surface of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refraction for water is 1.d r9abl06 8dvk8ap 8zzc7 t6tj33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a tmtr* )stjhu4;p* h wz(gkaw,i*; 7fc bt,vd7plate of transparent material at an angle of incidence of 7t * hi ,mj)74 a;t dpvc;wtf z*g,hswbr(*ktu$56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is incidu 9*,kx3hf7u qe cz3rzent on a slab of transparent material. The incident beam and the refracted beam make angles of93c,hr3ux k7 fq*uzze $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction oss cnd :p(h26sf 1.46. Light is passing through it at s6(chds pn2:s $53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light traveling from crown glass (n = 1.52) in wfyi3:.w0lzrt,/hxjd n7w7 zee,el4 to iwxh7y ezl/n re. w: tz,w0ledf74,j3water (n = 1.33)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of i/p -besplvk5b t11em4c 0a ;p1.50. What is its critical angle of incidence0-1tsa ki 4ppbbl1m5e;c /vp e?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic idywxw;ns / 3af4*q8 wwith index of refraction of 1.50. For what angle of incidew4 8wds*q wya;xfin/3nce will light remain within the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is measuren e eok fed.e748u,0phd at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance 2owge:hna9a 77c6ibdae** d zfrom air at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.*xr1a3nm ys9s h2 w:0rdwnr1r 1 ymil+0 meter long and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflectiox *lh+aydmrrws 20:mrw1 1ry sn3n1i9ns a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in fronihyr*q .8 l g7-a:kojut of a 20 cm focal length converging lens. How far is the image of this object from the lens?k .- qaui:hogl87*yrj

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with fop- islbvy e/ 9.sld36dcal length 4 cm. Where is the9.s/-6l3b yesddiv lp image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a qr+f )ap pxd98;2xrj rconverging lens, and the image is 4.0 mm behind the lens. What is the focal length of the le ard)f;r+x 8 9xpqrpj2ns?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object isc. *o *f ie,g(1(/ngbygkbp xe 4.0 mm from a converging lens. If the image is 4.0 mm tall, how far is1*b gicg pky/gfnb *((eo,ex. it from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the inverted ieix+j)gbm6y -n-a ).kt 5r nojmage is half the s.jbra n -5etk)oymj 6)ix +g-nize of the object. What is the focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens wikkeihwf 0),bf o o cm0nm+n5ov38bm*1th focal length 5.0 mm. Where is the objen 0 bkn5)c3i+mk omb 1weoh v8omff0,*ct?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm from a convergi.gc .9vbkii b--u3x m2z8iawjd6q u8nng lens. The image is virtual and 6.2 cm tall. What is the focal lengt28uni-wa 3dbc9 u 6zk8q-mj.vbx ii .gh of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a conver r/g xw8m;lx7oging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is the objewmx78; xo/ rglct?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is plwr fgi36,(oa+e5sz d39a fsm+tgc3c l aced 60 cm from a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farts+w35 rfd m,asg(t+cez3cig f oal396her from the lens. What is the focal length of the lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a i4j97 n7:aoapwbb wzk-ax-8 qdistance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, wjn4ax -7:8qpa7bz-i okwb9a of the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed a xr0 hb.)xliij6j-;ops:-gs et 30 cm in front of a diverging lens with a focal length of 10 cm. What is the im-.o p0jxx 6s g i;sbrjil)-:ehage distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with 9t,d7cj.bjqf ig1 p/oa focal length of 10 cm. What is theqg/ c i fj,oj1.p9d7tb magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, a c8yr/9 enjj9und 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How taj8n 9yc/rje 9ull is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in front of a dive2lm v t 8k:svhxwzd-+4h(m8pzrging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the foc:8hlm w(2z4+ztvvhs- m8xdpkal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens. If a 5.p6cz0 r ,sa1 vifan6:osgbmvirtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of the lgb0po6 1m5n.s rz: a av6f,csiens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal lengt5uhc;b.a 1hh8z0m qbfi2 c 2orh 50 mm must the object be placed if it is to form a virtual image m5huf 0rq 8ib cm2.2 ;ahzhob1cagnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length lens4t *c jd 6dl74a jsl-4le4ulnl, such as is used in many 35-mm cameras, must an object be positioned iful ad *4 ll 6esjcl-44dlt4j7n it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses6m,q*w o-:klu hy6qey pmm ;(dhsc0r2, each with focal length 20 cm, are placed in contact. What is the focal lenpw2:-sqy,(*eokldmr m6;umhq h6y c 0gth of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46 cm, z n a kl1owpt38yjv752:i 9cahicty5 4and is made of glass of 1z8 tv79 :nlycwyopki5ia5h 43jt2 acindex of refraction n = 1.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) has a radius np/p(7ijc ob)of 40 cm on the front side and 30 cm on the back side. What is the focal ljc) b7/i(o pnpength of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by u9l( (gezbzr0cw+ b,j5c 2ykm using a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the bacj 5myl,z20rwbc+zgc b(k9u e(k surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a fo1:g yfk9 ilrz8kl i3wx p/6 l+p;rgl)ycal length of 40 cm. It is made of glass of index o l ; )fyggwlz/9 pk8:ix13i6yrl+p lrkf refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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