Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, a4bxsp0j *j w w6mhj98pkch 6*end the formation of images by mirrors and lenses has been skpj*0*h9m4sh 8b ecwwj6jpx 6uccessful 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 incideni7 ktv ase0(3fce

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 w*mlysew)9gfid06dlw ,x286t ta kv y+ork 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 image that i1khp 1ut3gfe;.w 3sb (n t;d*54qpmfen, pzp ds

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 producem,wxyq(y4dg7g p( ;2cvjj r9r4,ega e 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 doaj*tv 03e4 xmtw0 v2p w5xuvl5 not actually pass through the image location, and would not appear 3mw4 t0vltj5v0w*px5uv2 ae x 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 cou2i8m6h h u u9a3,thpcbi9r;sbj)jx5nld appear on paper or film placed at the tha5 umnh;siba36 ,bx 2u9p9hi 8tjjrh)ct 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 virtual fyon l0mfpt2co 6.s439 q)lyuimage?

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 iwnr/)ju3 e-xld0t)9;v;uxtj 0(+ k cyas es tplace on the outer surface of the spherical shape is- t xjde0v3)xw/+isujt;n)yt9l e rck;u0(a s 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 surface of theqf*ll *oaz2m:cw - v*j sphere is referred-qm2z*j*wcav*o: l lf 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 7 t8yzv6 .b;amb7zpbaconcave 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 ,jearki)3 ;k oconcave mirror's axis, strikes the mirror's e)rjoak3 ik; ,surface near its midpoint. 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 irg3 )ehpi6gl)v-rov2 s 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 aa/ k6bl (vqwo;xis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection;o(q b6w/ka lv, 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 olp jno j,jl0wem:scj0k, *r8c .* 6pskn a path through the center of curvature is reflejpl 8kj:sp *so 0m.k*cn 0,lw6ejr ,cjcted

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 ccj8ckp 8 l-xn+pwrppq7l), z+oncave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflwc7-p r8p,x+p)ln+8ql kpzcjection, 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 theaol,erxe 1x-zfj8;o uia39w1q 3b ;rz- eav*i focal point is reflectedf uvo93-rloqb;8z, e ei1;w1aj izxxr-a 3a*e

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 raysyoy2ye8 )tor;pjq-v 0 for finding the image position due to a curved ;)ey8to0v-2 qoy y jprmirror.

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, kuhz7r dllf-v *5 *mil.m8eg7exactly at its 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 concav t2,u9 qw,m/hwdd j8nie mirror's center of curvature. The image produced by the mirror is,um2dhwi 9wdt/ 8 qnj, 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 mirror'ek2c.y *ufu 7vs center of curvature and its focal*k27e.fu cvyu 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 concave mirror's surface and its focal9di )iaydkpq6 lkn8qg(0ob1 8 point. Thel8(qodaqg0 b9pdi i k6k)y1n8 image formed 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 say:i pwmy /)n3hme distance from it as its radius of curvatur np)w/ 3i:mhyye,

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 e-kcdc6zgq 4 brhl/3l 04r9armirror, at the same distance from it as its foca/ -brh0c r6z4er ad9gql l3c4kl 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 g( (cpwrl fg28b;e ti)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 (convex) side of a shiny t8rplcgg) be2(iw (;f 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 i0zvej3l z. j1kilggv7smrbjkv-/-h d 7 z83+zmages 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 produc+tnc lv5ecry ;71a jl+e 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 mirh2ch*ki9xrpn/ 1itv, ror 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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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex sphegich: +lk9u9gb69k hdrical 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 for wd6:vk gea y b3*ld +yr,x3q-ba 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, t wwj:ltpbnabl(73y+j i-f50z fp .- hphe 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 image formedvh 2zhtku;bhv g-s 21u( .p6hh 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 value, the image:dq9y(-nx yaox7vkg * 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 negativxbm8( v.x 9kkcj zphnqrp y/ .p5w93w7e value, 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 magl9t578xnmj2nd/ tohe nification is larger than one, then the image is /t 2lhdotj 8xn975emn

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 mw p 1v;nu5,tx.,qkxp vagnification is smaller than one, then the image i5v1pnx u , qpxkvw,t;.s

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 magnifnr8d- *7cqs-vz z67epho6g go ication 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 fastesthf )g*slc.rzn*/ y(knj:v8y m

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 refrac vjyt/3-1vip- eul gw1tion

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 medium*vy6vpre ueiiz/+ f37 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 i 9jmz d1k,ksg0/ ah7 ckz-s:sps $2.42$. 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 incidenc(vifuso) nggfj8,o66n*m ckbf i ,7( me

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 ae),5t)* ::fii mohnoxogyj 7r n angle into a 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 ref)g 8/5urvpycg raction 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 traveling in air, is incident *,spir,jrze ;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 optics is basei * 6frq7fnhx 6a:up+qd 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 air ibcg/3 c6 2ttuis $48.8^{\circ}$. 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 work i)c+ )-r zhd0v)a f(fgbypd2wuv;k 1xo s

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 thicketypx7wo)5bgbc 22 ,ann ab1+y st 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 edges a ls5: m y*cce4*e*tidire 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 cemm6bl kysy)g kt0 6p):nter

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 6/*hp( xgur8 adji3znmp;fv-e9w u 9qat 20 diopters, whereas lens A is rated at 10 diopters.;9f3i/mv9 g-(hjzrqpwdu*a6 ep8 xnu 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, traveling parallel to the ax,m:-afe i)zkvvl3 c8fa 8bzb+jak9e8is of a thin concave lens, strikes the lens near its midajkfa)vc+89 z8 fe: k av-bib,38mze lpoint. 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 parallel to ;j:5/*lt l7x dep mpzt7i a1upthe axis of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of thea:tilt dj/ulp e7m71p;*px5z 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 findineob6sqh3/ a 7kg the image position due to a thin leba7 6eoq3h k/sns.

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 len- 1j yvpwt8:ft9 ctr:9xwdd b0av,1lngth $f$. 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 l,1//1vjoa+;hvy k /) o fqas /wyyxn u-qfiu3mength $f$. 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 focal lo s-xz.j6gsn4 g(qfo22l c; ufength $f$. 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 focazxl4omx;x :m r7 g5e3:+ngsjml 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 cxry /z3g, w8/71aosk/ dnrguum/r31 rf kk-clength $f$. 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 cokrvxjys(4 3tzfdyf 8,jz1 (x(nvex lens and its focal point. The image formed isjx3f d, z(4rxst (yzkj 1(8yvf

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 concaved0)wx .u:xpmkp1-mm h 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 rare stamp yo/ dg8qc,0hxffu 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. Betwe 8guucd/2+jg,hmhc q7cf, yz4en the lamp 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 pj 4mchh,yqc u8ggf/cd2,uz 7 +osition 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 len4o ucl qz 77wew d;6sxg-st7n4gths $f_1$ 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 plaxf 3pbxygdy0 1a 3c5/qq( khkle5t,-yced in contact. If each has a focal length of 20 cm, how would you expect the combination to functidqtf, xpyc3lq/ a(b35k-1yxkyh 5e0gon?

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 wu j+xt -.3 tvos;cjav;jx 1fmwu7. l0lith an angle of incidence of m1x3j -axov 0;lfj. .jtv; uwutl +7cs$52^{\circ}$. 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 pla0g 4m-hwnav7dwh:6 r tne mirror. The image formed by the m0tw-6 vwg h d4nr7mah:irror appears 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 0n*i 5ma ,ows)y.75 m in front of a vertical plane mirror?*a5s,ow nmi) y

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 plane mitfx,2yh b2c z:rror at a spee t x22bczh:yf,d 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 curvature of 20 cm. How far fro9rz8-t/sf b dv)m-qwsm the mirror is the focw-8rqm zs)sfb 9d/-t val 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 radius detv a ebq(-eazn::3 2of 20 cm creates a real image 30 cm from the mirror. What is the objectadzqna3:2v e-:te eb( 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 the i;;wjch 1f)dqhht q8 (wmage is 3.0 cm in front of the mirror. What is the focal lengt8 hh (jdhf1)cq ;w;twqh 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 concavwi6nid+ na+7ve mirror with focal length 3 cm. Where is the im n7di nia+6wv+age?

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 objz5f 3fdypddzq cd( z,qpi 6 wa3o-2 t5vq(v6x;ect is placed 10 cm in front of the mirror on the mirror's axis. Where is the image locateday d5odf(5 q vpdi,xcz6v f;d-t6 3zz(q qp23w?

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 mu2j0l0twz3w) qk hg/ wirror has a focal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is tjgwlth)qw0w0 ku/z32 he 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 conca.hepdl )hf8zfn9:i:p u b s*,rve mirror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall is th dr9spephnil,h ufz*f ) :8:b.e 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 foca0 d: *jabr;nnxl length 20 cm. The object is 4.0 cm tall. How tall is the ima *r;d0bxnj:ange?

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(v hcs )0ihs t,w8+ao k/dvl4qke:a6j cm tall, and 14.8 cm from the mirror. How far issh6c l4tdkao,s wki:h j+vv )q a(0e/8 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 ,qoqm+ wq2 h moh 84+7bqxq2zwns/u(vcm from a concave mirror. If the image is 4.0 cm tall, how far is it from the mirrorm47wxzon28vq2 /bs(h,q q uq+hom+ wq?

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 concavelhf5(yl *w. v1k 9goel mirror of focal length 20 cm. The object is 4.0 c(lo hwllf1.ykv59* eg m 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 f, p :ytw2rfpn,cnki9rp4yh ).pq u;* pront of a cosmetic mirror (concave mirror), the erect image is twice the size of the object. What is the focal length of the mirror2 w)fp :ruyny;npp 9thrk, p,.p4qic*?

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 shih aop ) 4bvc5ley6)o.aving mirror. If the image is an erect imageeoi 6 l)by.)pvhaco 45 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 concoys:.i 774javr) f cncave mirror with focal length 5.0 cm. Where is the obj oa 4c c77ryin)v.s:fject?

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 o z8u - e+(h -/qg,te/mh(ymc;efazzacbject is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?,;- -/e(m uzq8(af ytmh hcee/czzga +

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. z4ne-m8z lex(y0765x hafnwz An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the ima y-n (n5e f zx87lzzwehmx640age 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 convex mirror. The image is 5.8 cm behind the/i-knr:/.v 0ns oglel uwcw ;3 mirror. What is the focal length of the mlvc.: snr/ w3nlu0wki/e -go;irror?

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 tag3dy nce+w.*qll, and 14.8 cm from a convex mirror. What is the mirror's focal lengtq*n+cgy 3w.e dh?

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, whats6 ,d,yfbb 0tq 7z uxoq5vlmt. ;m)qv) is the speed of light thrq6 bbqf.q xot)vvls)zd, u7 ,ty;m50mough 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 inci:mhiyczg5/ v1rc6dr 6 dent on an air to glass interface 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 from air at pbc 60t5b0 aq6 maj/uji,px:b7 l0fsx 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 wa8c0 cfrbjz 1 ef.*bxcbx*; lns0:9-tfpw dz4lter. 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 smootg zxn:l48nqtqv (s/t/ *vhr3nmcd/q;.pec :uhly and evenly over the surface of water on a windless day. dpx.:trm 3:v *eq s(qun4t/q cvz cnn//;hg l8What 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 beneat ai1)b+pyd5lq)v;9.rxt serah 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 t bx)laqp1+9sy;a )rrd.ev i5index 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 of transparent material av7sr q.qo+vq31bbyx. t an angybs1+q.v3qqr x v7 ob.le of incidence 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 of transparent matrl pk 8jput352b5j3 uterial. The jk 35j8p23ptu tu5rbl incident beam and the refracted 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 index of refractionz (:5f eyps.9ggbtq 2y;tt- oo of 1.46. Light is passing through it at gtey2f t.5;( s tqo:zy-gp9bo$53.0^{\circ}$. 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 angl3x+/tl k7gqu+ ho3 jmde for light traveling from crown glass (n = 1.52) into water (l u7mk q++d3toxj/3gh 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. pxppw)c,kguv /k ;0o1What is its critical angle of incide/kpp1pw;kg 0vu)o xc,nce?

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 madf8i 8g4lx, o6blqp :rge of clear plastic with index of refraction of 1.50. For whlpg r,4i :ox8gf b8q6lat 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 for a sch0 wfk+io5 )vfh d j6*vq9,szubstance 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 at0hjz/h) hw*ks8(1q 1lteptmf al) e5mk3yl e6 $30.0^{\circ}$ 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 diaf4ft;2 );w fgshre -qsmeter 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 ; ;r w2 sqfset-4hfg)fend 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 front of a 20 cm focalnlzv+;5hn ,s 8mnq .fs length converging lens. How far is the image of this obje;sv.f5 hlz qmn+8ns,nct 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 a converging lens w6g *zlb 7x4powx3(of hith focal length 4 cm. Where is theg*7xx43( ohl6 ob zpfw 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, a9pd k7j) wph/to44xunnd the image is 4.0 mm behind the lens. Wh4 )9tjoxh 4pnwkd/p7uat 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 convergin/9y o )y2wsw 9rs5lzxfa:cz8t g lens. If the image is 4.0 mm tall, howsr/xw59z zc : wtao8s9l 2y)yf far is 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 jr,vcc6+ ; aailens the inverted image is half the size of the object;ac 6vircj a+,. 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 +2a9oe ewn9wffront of a converging lens with focal length 5.0 mm. Where is eao we+ 29fnw9the object?

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 cbs:) jwlc1ppk-40 miym from a converging lens. The image is virtual and 6.2 cm tall. What is the focal length of the llpp 10s4c-i:j)wkym b ens?

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 okmpr932br(jz*xiy,;v fxg p01)pkois 4.0 mm tall, and 9.0 cm from the lens. How tall is th2p m,zp 91po;rk bx(rf o 30)jgvx*kyie 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 cm from a convehfrz8 e*r8vsf0cr c) 7rging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image mrr z7f v8hf)eccr*08s oves 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 c:8hmrpzeihkebly 4+ 7o x od/5i .qnkmd51k*+m from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respeo5krmnldmib 8iz*o k7pk4 e 1yhq5.h x:de+/+ctively, 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 at 30 cm in front of a diverging lens wi q1 yoogmz3*a7i;l) jith a focal length of 10 cm. What is the imaa;igiyom)j*oq7l z 13ge 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 8l.o;tm2ysh u in front of a diverging lens with a focal length of 10 cm. What is the magnifo lym su.;t8h2ication?

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, anduqjmr l.qq7;yl,s ,gl-a1n0z 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lensaq,7rlml, yq. ;gl1un0qzsj- . 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, t3pc:un6v 6ed and is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lensn:6pd 6cuv3te . 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 40wj,z-+e/zhh k cm from a thin lens. If a virtual image fo+/h e,wj- zzkhrms at a distance of 50 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 focal length 50 mm must the objec eyov h3 y7oy j4(.5emgsrr6j6t be placed if it is to form a virtual image magnified in size by a factor o6 vmy( royy7j. 34ro jgshe6e5f 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 a4f ;6a,fxfw -cxz/o sax8a ;nes is used in many 35-mm cameras, must an object be positioned if it is to form a real image maefs o,awc6z; 4aa -x8fxf/nx;gnified 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 fo7al rn .ra74-t0 yatbrcal length 20 cm, are placed in contact. What is the focal 7rattl4 b yn0.a arr7-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 levpshzq fczazv8-:c3 .(f08 ng g9,xdwns has radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is the focaz., zv8wp h3dcs(fax80g9:g z- nqfvcl 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 radiult(5ahomd4bq iv65p* s of 40 cm on the front side and 30 cm on the back side. What isaltq*id65vh (m p5ob4 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 (nh axn wjk g.4kw9 /wjjx )w+j2v0iw;yz10is9y = 1.70). The radius of the front surface is 20 cm and the radius of the back s0i)+yi4w1kz j nsaxxyw;w 09 /j9jkv2. wjh wgurface 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. Idro2q2 kh :t28cwk6 vdfk((mb t is made of glass of inm8kk odfh26b2q(2(drckvw t: dex 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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