Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, ,hk 7;7mzyl(s vl4yb tand the formation of images by mirrors and lenses has been successfu l,l4yz7m bskty(; vh7l 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 incidenzlk2s +z4jfjc(x87k s ce

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 mirrors work ih(*eb m nu4n:wo:rpm1s

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 image *jqllk;orcwn3(b5x 1that 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-e59 1byg0gykuzz;es 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 actuallyv rk a,tpg(f,*pj /s)y pass through the image location, and would not appear on paper or film placed at that locatpag y kt )f/(pv,jr,s*ion 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, aj,etkc /97k 7wr lyep0nd could appear on paper or film pla79r/yk eeklc,p7jt0 wced 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 sees 7w/ s 6g/cy6v.9hif fobp54n)sjcvh a virtual 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 placcq : a6tyz4u5me on the outer surface of the spherical m auy qz46t5:cshape is referred 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)tjh 9sh0yj 5x surface of the sphere is refer9jyh5 hxt0js)red 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 curvatu8:yt o aj+q4cxre of the concave 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 a concave mirror's axin42f.rfs:hsb93c nmbn m7/y;iki +m js, strikes the mirror's surface near its mf . byhj:mni/974 bc;nf+3km rs2 nmisidpoint. 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 p2-g3n tnk1qldath 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 mirror's axis, crosses v, ontx2s.w-p the axis at the mirror's center of curvature before striking the mirror's surface. After,pntowx- vs2. 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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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 throu hb *3fr9prtmq*;vu ,i f,flf(gh the center of curvature is reflect u* ;9l,(t3m,ff rq*fpbhrivfed

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 :;e-xi qz4qacmirror's surface, crosses the axis at the mirrorizaqe4x:-;q c '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 thr wiz dc8 r1-v (5grmwkji03,rjough the focal point is reflected,wmi0crr8jjd1kg v-zr 5i 3(w

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 fl1 z6 (hez; ul3t8:sw.ngqkpfinding the image position due to a curved mirror.lu:8lz (f;s.g 63 h1nqt pezkw

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 ithxzca6,q,fq uv ycrw0* -l7.is focal point,

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 curvature. T n1lh5b )l1l xfrdb;ok ,zr6t3he image produced by 6fb)rbho 3l1dllr ;,n 51xt kzthe 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 concav55d ) wz0x lkvg1at3sb+5vql)ifdf: ke mirror's center of curvature and its focasb+k05v fa)kzifx 55dq)w1ldl 3 gvt:l point. The image produced 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 corh.(fz0 zwtt 3ncave mirror's surface and its focal point. The image formed in this cashfwrz .tt3z 0(e 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 of1fs4e8;6fxz yhok8q l a convex mirror, at the same distance from it as its radius o6yx ef8hq;f8o14k zl sf 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 same distance f ylhq,6yls+n q-ljpz +d;)g yqr5: r* repj0v6rom it as its forl lj y-5 ;sy6r 0)hl6,+pgdye j* v+rzqqpnq:cal length,

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;ythuqbe8*2jx3d9he ok8. otuqz/rmu4 f4 0 s a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a lit/o8fzbu2 qm 9 h hjr.yeueot 804uq ;dt3xk*4stle you). If you look at the bottom (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 produyg:-v3 byak-t(kxn:( eb.z pmce 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 produce images whooim(t( ;mzf ;ich

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 produce myc 59b3 yz(j(+how,w-bon ufs 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 sphericmb )q*0f, * ik-xczmnval mirror produces 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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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification f: hp zsp64a83ltw *je1 kg (qntyz*b89vqb)onor 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 i asu2k6,wf 2xrmage 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 image f3pxyohcfh20be;-(r 50sv gn lv wt(e6ormed 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 valuacspv n:+ l-/m3xh/p ke, 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 u45gyco6 vw7qvalue, the image is

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 magn8oo cnqkg:7kmory*)c(kn+q,,h g ym ( q 2rnc8ification is larger than one, then the image isk)kgc8gcqo yo(:rq+m7 , y *o8nn,( qch2 mknr

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 smal7f kmebzw;3 kl2pfc):ler than one, then the image is; flz:3ecbk )2w7km pf

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 k/hg 6oezni 41equal 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 fastestyk:yo:2qq. - g*jursg

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 materialo;v yln 34ndlt z;3)1,yivq8d4 5hlo u8xgots substances, 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 less than one for a sx4r0 f5 zc 50om nmoxkl76v9dvh5ubq90pb:y 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 z0xsbouu+(ze7f czqc 1p 4*- j$2.42$. 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 incidence jy*e3oj /t9kyl )4t+zb8jn ir

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 dels zv-ji+yb :o7a3rtrs .n9na976q t dnser 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 refraction will bj jmcgc8lkan*m t(h2 09+tj9ue

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 traveling in air, is incident on a glass pmi62 da5phvm4 late 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 optics is ey:vdm0rqj p:p1(x0e 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 passoql- 61o fj6,rw3 pdwcing 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 lenses /ibw it/ym0:d zkm71xb:cqk,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 thickanvt2 baq1sn ;kx1 h*1est 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 cenr:s nn58pg8 prf+xq5wter 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 1cqz 6k.fd)vdus;;+lje0 scsthe 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 at 20 diopn1u9nll is9/mters, whereas lens A is rated at 10 diopters. The focal lengthil1m /n9nul9s 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 a thin ck d10 okcmx) dfv349qdoncave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerk)k3x9fdcoqd0v 4 d1 mges 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 parallel tot3vd+0/h6v tpx c iz1t the axis of a convex thin lens, strikes the lepchi t/0+61v3t dtvz xns near its midpoint. After 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 rays for finding the image position o6-( 1llsau ) zdrv4ztdue to a thin lens4(lza vzd) ts -6l1ruo.

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 focal1 p06y 5u*ko jos2o-(7/zoazm lolm5yzftdk8 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 fovh7pq*kr1o5a2 9pt fncal 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 fxo) *avv+f5oe 2ay5as ocal 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 fk-evbr5ro01fcyib-pb( c(h 1ocal 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 focan+8orifw:ljiqu(. 9 sl 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 convex lens and its foc6j ugyj v9lqzb,6q)) mal point. The image formed is)66jvy ,m qbzulgj9)q

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 concavejxdt8-ccxb 6d z/)5 we lenses

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 rar 9o;tdr0.wm/b yeqjj/e stamp you see through a magnifying 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 lam4yjy f 260o3x-rifl i13gtjo2v-ugav p and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens position is varied with respect to the lamt i2v0g r2fiyux3ol1 fg 3- 6o-jyaj4vp,

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 k:big w l41zb2lengths $f_1$ 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-conve lb:b( byjkfm 8exu51.x (convex-convex) lenses are placed in contact. If each has a focal length of 20 cm,:mx(.jfu85 1ly ebbbk how would you expect the combination 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 j 4x*1 0epc+z;dekvz fsurface with an angle of incidence of ;x czf+4dv*z 01pk eej$52^{\circ}$. 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. The image formed bwcp)bsqd/.i m 6 kks*as ;/ew*y the mirror appears q m)k*/k./iw;dsp6s swba*ce to be

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 gtz)idsv zq06u+/;jpa t5 qe5ur1 kj ,m in front of a vertical plane mirror1z6atiu; +/tsj0k5j) uv, qz e5qpgdr?

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 yoj2f ggx mh01g gw+rh;,u approach a vertical plane mirror at a spee2rjg g01;xh hm+gfw ,gd 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 radib ms:d )8( 8wttz81k pt1lhhkomw j0l5us of curvature of 20 cm. How far from the mirror is the focal point locatwj0kdsw5t h8pk8l( tz ) ht1mm:o1 8bled?

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 zb,jwzvm m/mt 6z+ -g e47ri9greal image 30 cm from the mirror. What gi z7 +6vmt/mjmz-9bzew4 gr, 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 mirror, and t7yi(a /9ogp:0qwtsusbf z 6)x he image is 3.0 cm in front of the mirror. Whaqg9 it):/67 u sxay0wf(zbs opt is the focal length of the 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 fl5 .et 5hws o0)vergg/nt ;q.wocal length 3 cm. Where is the image?)e .w.g05/trhqnt ls;v e5o gw

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 20 cm. An objecwde9jw3j *y:uh*usxkjl3 , l5t is placed 10 ck:j 53sujj9, w*w* yldhux3 lem in front of the mirror 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 oca jd9nfb+ mptmq9*3 )u) me+of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where)qmc o +9e+*pj)tmm 39badnfu 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. The image i*0bdinyq kjb119*gy-tcxo0i //w gtp s 4.7 cm tall, and 10 cm from0x*/nw g1t-9/gb bdy1tp y*ici k0qjo the mirror. How 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 mirror of focal length 20 cm. T/7u.hwn c dao( j6.p mocjn46ghe object is 4.0 cm tall. How tn.u 6wcj.a7/omo6pjdh4(gncall 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 93j0k+pxib 6kyr8 u s/-zaqlg 38.6 cm tall, and 14.8 cm from the mirror. i0ql-8 /y 6axskj 9kbr 3pgz+u How 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 ch9.a)c3 u16huuk2 sarjdf3d aoncave mirror. If the image is 4.0 cm tall, how far is it from th hucja1dsa r.f96akh23u3ud )e 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 ty ht2gt;f9+f cm from a concave mirror of focal length 20 cm. The object is 4ytfth; tg92+f.0 cm tall. 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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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in m;dt6)o)/5(shbqfoolfxa,n front of a cosmetic mirror (concave mirror), the erect t(5 flxdfm bo;an) 6/,)qoho simage 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 inie(xwg l/rt8)ei9n+e front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal lenen8 9iireg( w/ )et+xlgth?

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 mirror with focal length 5.0 cm. Where is t .sc q-rnp8isdb)* +bnhb rssqn)i-bnc.8p +d* e 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 cm.rzbex 69q*1.nj,nwq0 s fdvj(ego u,8 An object is placed 10 cm in fb9n ur g o1,.8fedq0*6ezwjs, vn (xjqront of the mirror 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 co/la 92f//zvw*y 9bn a :vslmkm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the imagef /vnk w :*92 v9/azlm/labsoy 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 a cdiyt7(c i- 4kipr9/q (3j0ytt jdy)hmonvex mirror. The image is 5.8 cm behind the mirror. Wkd)ijj3 t/-70 phtqdri( yi m9yyt(4 chat 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 cxywvmy8vi7pn665o4fv pbt wb+67my 1xwk (-zonvex mirror. What is the mirror's focal length?pw(m-5y7 wo6z1ip4y btw86fvvxyb6v n 7+xk m

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 inde fg(vkrrlfee4qw.2- 2x of refraction of 1.50, what is the speed of light through fvke e-gl fwrq4.(22rit?

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 aavpe9b:iq ;r0 n 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, ,gqs oavdw0f+ rh ),*;fneamom 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. T5a7e lmbv;x +fhfz,dkox 6. ;yhy6. h:4fzlx qhe 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 and evetg+,mcv f+nz+t5 h e 5o*xs0dqnly over the surface of water on a windless+ 5dgcvqx+f es0+5*tohnz tm, day. What is the 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 c(6)axwsyu6pl+s3 x-cu ke+u of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bx)+ u- 3el+ 6ucwx6(ssypuakcank 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, 31d ,q:dve/q/1jl b91 obml cznqc l.nstrikes a plate of transparent material at an angle of incecjqbl/b nv 9c 1m,.31:q1lql / ndzodidence of $56.0^{\circ}$. 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 on a slab of5w.rz c-xqb2/iqi+ps transparent material. The incident beam and the refrac zxq/qbr 2ci+ .siw5-pted beam 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 inde xigd/a1e2vm6x of refraction of 1.46. Light is passing through it at xe 12imd ag/v6$53.0^{\circ}$. 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) into j4oaaqm+ 9 v;pwss(.9ybvno 1 wj.w9n4q;vy(1 p b+ mvoaas9 soater (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.d , be;-8aemqxzj, ,dy50. What is its critical angle of incidence?abx-q yj8;zd e,d, m,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 with index of refrc) k8 -e uq94f)kobkmmaction of 1.50. For what angle of incidence will light remain wit-)mo kfe b4k8)m9qkcuhin 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 measb sc)a ry0:b*sured 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 g2/g6o-mu+orh:qig of9j/ gfq x 9w7k6v z- mfair 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 1.0 meter long 9hyhl) tle (3h6:f4z hu/uqx aand 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 reflections a light ray entering one end will make before it emerges from /)( a x:e h3yhl4huf69tq huzlthe 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 20hlq2b yu-qr1oy q- ,0ks0p.tv cm focal length converging lens. How far is the im ty0oq,yprquq- 12 l hvb-k0.sage of this object from the 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 a9*jmpj q5cp aq)a+yf3 converging lens with focal length 4 cm. Where q* 3jpa9yfa+)5m q jcpis the 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 converging lens, and the idpii (5dig d(rvp( , 8 8vz8a9fwt+brqmage is 4.0 mm behind the lens. What is the focal ,95v(a(di bgpdtf z+qi (irpw8 v8 d8rlength 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 ishyox-vilml 1 qle(/ba5n k5.l/ dq53a6fa+sn 4.0 mm from a converging lens. If the image is 4.0 mm tall, how far iso kqynqlal+nl5bfesm3 .1a h/5/6av d5l-(ix 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 lecc 4v p;0wur+kns the inverted image is half the size ofckpr4u0v+cw; 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 with focal length 5.0 mm. w9ev nhfa*j1 l, rlai8yv/d74 Where is the objec* ayila9d,v4nr 1wv78jhf le/t?

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, xc 9bcjli/t:8prnh680 s mvs3and 10.3 cm from a converging lens. The image is virtual and 6.2 cm tall. 8:n 9mx36tvrc/lsj0 8s pcibh What is the focal length 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 converging lens. Thego+ca,:j k xp; image is 4.0 mm tall, and 9.0 cm from the lens. H:c; gopjkx,+ aow tall is the object?

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 wcu+s.dr/rol fzg-t01qp7 :ycm from a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, t f-r: wq1osd/trg7yc 0zpl+ .uhe 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 at a distance of 30 cm from a thin nmwh1ahi+fb* xs-)h*k/m q t8convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and im+ hxh-k* 8)*nsqtbhmw1 /aflateral 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 2xl iue 9tie7 nll*i.i2kf5 coj gihx74+13ww at 30 cm in front of a diverging lens with a focal length of 10 1+w lleie5o igxtln9xc 7 f3wi242 .uih*7jki cm. What is the image 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 wh/9 vd9b kfbx,myn x2-ith a focal length of 10 cm. What is the magnification?b,x h9yk/dxm2v9fn- b

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,; j iiksj3u;(b(lcxf p+ unj-- and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How tall is the ilpusk;+i- -(nx (3j ;jj fcibumage?

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 front of a diverging ley2hc7pj 6r13szv xia 3an*em*ns. The image is 2.5 cm tall, and 7.5 cm from t ina2rv71e mc* 6jx 3phzy*3sahe 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 9crua sn8 )w/ya 2ue24+rkph yfrom a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on 2pc29rrysu8he+k/ a)a4 wn uythe 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 focal length 50 mm must the object be p h c+1e5*anc;o/d1 sm)u cz)mui o)lwylaced if it is to form a virtual image magnified in d)cucu com)e l *)zmho ;nw+51/sy1iasize 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 lens, such as is used in many 35-mm clwdm0h(hrvi 1t9y3j/b +8vmie 7eo b7ameras, must an object be positioned if it is to form a real image magnified in size by a factor of three?0e7 h 3(+ ij h/my7bwvr91voed 8mbtil

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 focaty k/i-xb bt*k5x;f5es r5cx2l length 20 cm, are placed in contact. What is the focal kbitxe*f5t ;xk5b2 5sxc/ry- length 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, andyuu0ib 5xnc6+jzz9 j* is made of glass of index of refraction n = 1.60. What izn6j0b5iz* uju9x+yc s 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)c qprzyp49p1;*onok/ n1dr6 s has a radius of 40 cm on the front sidekz;r 1 qypn1p6*nsp rc/d9oo4 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 forpxy.* 7z42 zvotuy9;yvqzqk o; m6n( rmed by using a piece of plastic (n = 1.70). The radius of the f 2; p* kz.y(o;nx7yuvzv qy6tzro4qm9ront surface is 20 cm and the radius of the back 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 focal length of 40 cm. It is made o8 hw/i7d 2sobof glass of index of refos/ ibhw2 d7o8raction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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