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

1#

Reflection, refraction, and the formation of images by mirrors and -ciwcsk69mj; lenses has been successfmsck6;jw- 9i cul described 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 incidenceufj1 +67a* ocgy v7cvn

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 mirp3 eqs/ nq-m e*v)csnw2wys2-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 im8 ue y)3o xm ;a1d24gmxrjr:ehage 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 images whibs ft46pl soxto9 .58,jbl3 rich

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 3zt3 zv rp3n xcb3:+ah5f:moz not actually pass through the image location, and f3:x3zntz5rzco3m:+bhvap3 would not appear on paper or film placed at that 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, and:kw-rl2fn /lbu j9.m2e3q spq could appels9/-q qr2l e.fkb2m3:nujpw ar 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 vi508tt8vs;d bomz s,ou rtual 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 9etl8o8ivdlwss w,0.reflection takes place on the outer surface of the spherical shape is refert 0,8se dvli9ow. slw8red to as a

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 the inner surf2ya3i5jb ujfw lvi rb33g/(b bt v(,7qace of the sphere is regy ,3abi(bt2vj3vl37/rb u f(b5 iqwjferred 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/x /()map s rqdoh0.zy 0 ;kgle;eu+en mirror is r, 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 ahcwcqy7 i9np,pr. khv+-o.x3 concave mirror's axis, strikes the mirror's surface near its midpoint. After reflection, this ra73x9wnyv q ciorp- kh.+p h,.cy

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 cczc5q-ghc0 x366 icf 1 k,wgkuoncave mirror on a path parallel to the axis is 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 ,bory,* jgdk 7(n5x e ,vyc54 . ptl3wist-lgnmirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, this,7t.wesky -ng4xo, yp5bl3 d*r5nv( lc j,igt 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 the center of curvature is4ww)1mkohd.oilj- ifu45 hi2 reflecteoiwih4)j.d2lmi 4ou-k5 f 1hw d

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 surface, crosses thegh i7 j-wu6 s.jkbj9i7rqh 4t* axis at -6 *ibsgi47jhkjthq. uw7 r9j the mirror's focal point before striking the mirror's surface. After reflection, this 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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17#

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 the focal point is ref iv(; lap28p6xpvz ub;lectedv( x6p8luva;; bzip2p

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 for findizs: h1)i5mnw 79h qzwyng the image position due to a curved miqhi9zs 7yz1w m 5:w)nhrror.

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 pointywz72lh,c;uzy 9 f: tq,

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 cur urkdc q1xzm/2j9nk n:r7.h l1vature. The image produced by thnc: nmz71x92hd 1/k.rr ukqjle 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 between a concave mirrodnrqgfxqx 7 ;l(prjn)b;7/f; r's center of curvature and its focal point. The image produced by the mirror is located;rnq;7grx/ f)lbqnp; f7 (x jd

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 itsh :q;vnfduvcm p:mg ff k4z87f2f,jt997 t nj( focal point. The image fnm f t,nz9dg7 9f8m; c(q7: v2tfff pk:4jhvjuormed in this case 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 front of a convex mirror, at the s 9fn4xo7ye56mmth n-eame distance from it as its radius of curvature,f5x4 tn7mme -e6hoyn9

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 same distancf-os)v hx9i9b tph1 t3e from it as its focal ls91i fttvxh9 3 )b-hopength,

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 lookg umjh814*e3k9v0 ryg( smszvg( bn/m into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom k(8gs3s4g n*vmbvmue(j1g0mhr9z/ y (convex) side of 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 images whi5 +tbb:k mh2axch

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 produce images w 6 oi-7t8(lkx3/uoidpzs -ynuhich

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 producefb:aab;(u 9g t-wd nx+s 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 wt; j*d ow*gj;tg:: c,zt6pcpgv,mi*chich 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 t(nt+1tjv+ : pqsi3py for 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, the image; s4usqm3o 7dy 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 iktzke731t td2mage 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 positive va3b-oqb /svpa9lue, 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 2zmah wfnk:9 q qe91s3is

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 valu5;; smcirgc:v0utg r 1e of the magnification is larger than one, then the image is;mgci: u51 trr0 vg;sc

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 the magnification is smaller than one, then the ima1+leg:ex mz/b7 bjbw)q1tp+5 -kw bnsge i-xk+wq5)+ ns b:b7m1b/ bptl1g ewj ezs

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 magnificatp9zr d-- 0if7wlpnl4 og6 fj0eion is equal to one, then the image 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 fastes2 8oi0 :aq/.lnndofpht

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 sud0di8 zhn,b (rbstances, the index of refraction

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- ;e2melkq1 au less 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 diamond is m;33ee1n,(+q uj -oz tg b; 0k-nfjsy hsrm:bt$2.42$. 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 incidenug o, wli5:(c :5ldsixce

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 a denser mediuq1x2dt. 3adj o2+kqaeg4dt +um 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 roz djclznd98cz2* 0m :ew:oe1efraction 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, whicvie m;*x :cek9h is traveling 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 fibj0fc) (vpg/t6 s: wdpaer optics 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 lighnq4z9rluyc4 dq ;52sx;3sy j mt passing from water into 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 lenl j(w-agod-uh1/p4 bw3ay*vqses work 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 at the center chy29 l/f:e muxalled

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 thinr7 9nefu.u9 n5*lichzner at the center than the edges 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 at the cr:jsm vj*fl05sp4s+ 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 lw y4h8 4mjjy1qi 7lqe.ens B is rated at 20 diopters, whereas lens A is rated at 1my1i7h4.w4 e qy 8qljj0 diopters. The focal length 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, traveli1 )n ydtif7u0p0u4p ijng parallel to the axis of a thin concave lens, strikes the lens near its mi040p1 y pujinitdfu7)dpoint. After traveling though 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 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+hf;e ,e2 huhkm/b-adknz1d9,7qmgw parallel to the axis of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges trav+ hk /hne-kqdguamemf;,7d z b1 w9,2heling 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 rays for finding the imw2:8b9kkrbfr x2g2eh r g -oi/age position due to a thin len8ek2k9rf 2bx/ oghr b2iw-gr:s.

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 focg52bw ixd7(v lal length $f$. 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 focal length .oqiy-c ot* vupa: *9a2kk(3.xzr ezh$f$. 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 focv*mkh7yjak1- h .:*pxqm(1q vkt5caval 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 focal ln :np(ytem1dhk:a8 zwv6 gf;l*2l z2xength $f$. 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 9: .q 4aue ahylwnjky-lo5 ;k4focal length $f$. 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 conij6q dub vl2.9d9k6-r0p wmc .7ipcdnvex lens and its focal point. The image formed i b u6w.c9d n2 ki.qmip6d9rlvcjd0p-7s

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 le)ttd y,.e0e *cqq/c u:gpczi )nses

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 magnifying glass iqw d*d: wr1s9ds2mj 6ds

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 screeno /g(1 wy.n1uigwlp8s is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. g owls p(wgn i8.u1/1yAs 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 focal ogc bluja nk f x,+94;-tueg7d(5u hn-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-convex) lenses are placed i hyjh r.7yi97wn contact. If each has a focal length of 20 cm, how would you expect the combination to 7y7.rh yi 9jwhfunction?

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 ref qnj3fd2c j4.blecting surface with an angle of incidence of 3 d4. 2jjcqnfb$52^{\circ}$. 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. Tqy;q67 c6a hzze x9m1*k+yk uxhe image formed by the mirror appears to y; kx*eucz h67az 19 qq+6xkymbe

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 inhw7 n.kj6 ev /9-g/njlbapfr4 front of a vertical plane mirror?fj 9kg/anwl- h 7r epn.j/46bv

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 vertil8w ,4rqgw8r rcal plane mirror at a qrrwr8l8w,g4 speed of 2 m/s?

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 radius of curvyzoe s3p rf3gr:u/q// ature of 20 cm. How far from the mirro:qpu//33yrgze/ rfos r is the focal point located?

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 ra f foms. ,u+n*gdbr3de qibs9ah+8;8jdius of 20 cm creates a real image 30 cm from the mirror. What is the object dist9fj ,8bds*.8ium;++gnfes3 b hqra doance?

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 mirror, and z*g j39/a) a mm)ugngkthe image is 3.0 cm in front of the mirror. What is the focal length of the ajakgg9/)nmz)ug *3m mirror?

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 concave mirror with focal len7gbc y -bgjr-2gth 3 cm. Where i y r2j-gb-cg7bs the 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 3upqjp .ps84w mirror has a focal length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's au .p4pq 8w3sjpxis. 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 fohfg (9oqgc)g 9cal length of 20 cm. An object is placed 30 cm in front of the mirrorhc 9fg(9gqgo ) 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 fromnws 6tm,0cqvai .1- ;k4bc clo a concave mirror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall is thc-w , .ic4m0qa kncso16ltb ;ve 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 cmi q.cn; 2vrig7 from a concave mirror of focal length 20 cm. The object is 4.0 cm ta. g2 vcriq7i;nll. How tall is 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, and 14.8 cm from the0c 67e)pz:v v-gb :vkjqfh oyu48 ozb6nyo4 +p mirror. How far is the object from the oj6kvcp484 y7b ypgz n uo:v)vbf6 hq+o-0ez: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 iyk ln6ao 32 6ql01exibs 4.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it fro3016aqeblyx lki62no m 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 fo t 8ba8lhr()l5wc d/zjcal length 20 cm. The object is 4.0 cm tall. Where is the il8a t/ lc85)zd(hjbwrmage 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 cm h;r:qj:v .e wpin front of a cosmetic mirror (concave mirror), the erect i::r.q hpv w;jemage is twice the size of the object. What is the focal 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.y4i;9d :* .tkkj)e+zjkfko71 qzyw ir If the image is an erect image 1.5 times as large as the object, what is the mirror's focal )y k.jiw9j yd:z7*et4 ikz fqok1r+ k;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 concave mir+ 1hll*o e .docfs;h7j 0c7wszror with focal length 5.0 cm. Where is thzd7o.1 ;f 7hccoe0 l+jws l*she object?

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 cyw:7gi4en) qim. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is tenq7 :wg4)iyihe 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 z/8 bvt- )ahysza1ji4of -20 cm. An object is placed 30 cm in front ofzbaji-a48h)1 tz sv/y the mirror on the mirror'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 front of ah ,xomeath.89k2f v5n convex mirror. The image is 5.8 cm behind the mirror. What is the focal length9 vh ,2x5eo.fh 8atnkm 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. Thef: u clv8uac(m0 qd12lpj- 9eq image is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mirror's focpe:-10l l q8 2a(c fumud9jvqcal 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 speeo6s/beb3 6tcrv5 st*nd of light through i*nocs 6t/r5sveb t 3b6t?

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 interface at an anglefd3s6 ;kc;;8ohzckm p 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 from air at an agdlb)s)ew2 ke6yt .*hngle 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 wgjtvb ; z)xm x-4:.(znm +ymuw1;givvater. The incoming ray is at an angle 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 awv/ 3/l2zxj yreuu* 9j9t2b;bqn+ sf hnd evenly over the surface of water on a windless day. What is then ;frzj/jehbvu3s9 l2 w*/9yq 2utxb+ angle of refraction 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 beneath the surface of a still pond of water. At what angle7 e3, b1xrwyy,i0k v(wkbyd fnh.r1b1 must the diver shine a beam of light tow,7 dyirw bbe.rk1 fy3 1k0nvyh 1x(,bward the surface in order for a person on a distant bank to see it? (The index of refraction for water is 1.33.)

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 plate ofzpqtd2mc1+x t 3qqs *) transparent material at an angle of incidence o+cmp)x21q 3 qsz*tt qdf $56.0^{\circ}$. 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 incident o izsl4l(lq(w .k xs(tg:2de4a-finb0n a slab of transparent material. The incident beam and the refracted beamfldkt-nlw .( a24z lse(q0(bx:4 i gsi make angles of $40^{\circ}$ 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 refrac k*+ pzfl:l2bution of 1.46. Light is passing through it at :b pzku *+2llf$53.0^{\circ}$. 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 crocm 08ldi20:tzlbxi/ dwn glass (n = 1.52) into waterz2lt/c l: x 0i8dbmdi0 (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 1.50. What is its criticalbtted) :e 8 rb5bktz9k6y:-mx angle of incidence 9zbdy:)6mbtr:t5e-tkk8 xbe?

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 with index of refracpn (ds3tc-flro s3n)oo0+vyk x e07wt *r30xition of 1.50. For w xv ocrn to(r dw3s3 li0 o*ef-yn+k3x0s)p7t0hat angle of incidence 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 for6j8 b/-, erywnuk*ee h a substance is measured 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 from air ataczto 0g)fu-+yod8 1t $30.0^{\circ}$ 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 1.0 meter long and has a diameter of 20 +q)p xu*zcvi v/nd+vc wp; 4+hmm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerge)quw;+ +*c/zvp hid+ vn xc4vps 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 front of a 20 cm focal length converging lenw.tp02e:i6 wmkqq b bjkn+j 2 0bg-y:oxm0vp8s. How far is the image of this object from the +ynm kwb2m:p.0jqe-02 v :0p6o bbixtkqgwj8 lens?

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 t2r042 i k+ih7lsa1nad+6io2z udm hp with focal length 4 cm. Where is the i1 tr7dd0u2i24im+ o+hpsk2na6l ah izmage?

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 converging lens, i xruym*/q 5;h/ya i8fmev93 wand the image is 4.0 mm behind the lvwe8fmu5a q*3xhy /9y ;/m iirens. What is the focal length of the lens?

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 is 4.0 mm from a converging lens. If the image is 4e3kljuiec1w mc(i8 0*0* vx)i wyf ae0.0 mm tall, how far is it from the lwyefi1cm3w8vx ic l)a*k0 uij0e(* 0eens?

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 40wndm a9-ys6(ze wcu( 6a8 )qha.x9 bbg m in front of a converging lens the inverted image is half the size of h9wdq6-a e wxuab8gn(.s6 )zm(cab 9ythe 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 with focal leng*n)1jnql u v-d/mlfp e/opa5g0z t91fth 5.0 mm. Where is the object1 fl5agppou01 */fd)/nvt-m zqe lnj9?

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 conves.4hi9v* me(mst x1 rlrging lens. The image is virtual and 6.2 cm tall. What is the focal length of ix*9lhrtm1(s4msve .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 converging lens. The image (4kmvtpl6ni .ui l we.x:ee-8is 4.0 mm tall, and 9.0 cm from the lens. How tall is the objecte xl.l6. e:i ktmnuivew (8-4p?

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 placed 60 cm from a cod5c 7eiir:vxx5a *+ k;bfv-b knverging lens, it forms a real image. When the obj;ixaxekvb5:bk + 7fr-idc*v5 ect is moved to 40 cm from the lens, the image moves 10 cm farther 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 atz8 on1vni+2 w-k1tb7ox o rw7z a distance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respezb o kwo7o7wx 1vt+rznn28-i1ctively, 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 atrn ru6)8w :ttk 30 cm in front of a diverging lens with a focal length of 10 cm. What is the image dis):krurtw6nt 8 tance?

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 g*)d 1vhgbvqtd8gubw 6l6/oa wix4; .a focal length of 10 cm. What is the magnificatl.g* gw6wb4t ;xovud 1aid)/6vhb g8qion?

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, and 4.8 cm in front of a dvmkd f4mp2d wr:i kx4l,m pd/d6y+3c3iverging lens. The image is 4.0 cm from the l:+kmi32dvkmwdc 44 ,lr3dp d6 ypf /xmens. How tall is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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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 fronxei(yl x w8v 8rn*9d2hwl1zj4 t of a diverging lens. The image is 2.5 cm tall, and 7 y*exh(d wrx8ilz984lw2vjn1 .5 cm from the lens. What is the focal 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 e8xlbrdmd5w.lv.l b*6qcy*7 virtual image forms at a distance of 5qer7.xb dm8l*wl * bc5yd6.vl0 cm from the lens, on the same side as the object, what is the focal length of the lens?

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 fovw0ed+pl+:f ap/ kn zwp;6 /kscal length 50 mm must the object be placed if it is to form a virtual image magnified in size w//ska dp++k;zwfn pvp0: 6leby 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 lens, such as is used in many 35-mm camerr0re4a fm*s 9hqb5ss jd/93dqas, must an object be positioned ir4 q m/dbfhs*95jed9aq03r s sf 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 lenses, each with focal length 20 cm, are p;yu5w9+ usppu shj7 ,,brt u8placed in contact. What is the focal length5ypj +t ups,9u ,srbhwu7;u8p 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) thinkleh*/ b/e 6 9v*l61kpnwa5f kck-k sd lens has radii of curvature 46 cm, and is made of glass of index of refraction n = 1.6fkk* pl 6/cel sv/e6 ba1h*knk-95dwk0. 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 of 40 cm on the fronxc6 mc-y,jpc 2t side, cc6cx2mpyj- and 30 cm on the back side. What is the focal length 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 using a piece of plastic (n = 1.70). The radius of qlq 7gpn/8o 8gabq*n+gci.)l the front surface is 20 cm and the radius of the back surface is 30 gl 8b+g aq)q*qi /n7l gpc.8oncm. 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 focal length of 40 cm. It is made of gl ja +gv/ bs3,whrpvs67ass of v3sjpv +s, /h 6r7wagbindex of 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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