Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mir.ao9;fwdezwd s*5qo +rors and lenses has been sddoqf 5 e9ws+wzao* ;.uccessful 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 incidenckf rf2f,d 8zyfo 2(fi:e

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 16amva+ s uyl+i: i41exrlks1 mirrors 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 image tfk9yz ued3v 4/my -/ pdk9srv l8-aso4hat 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 imageb hgem:z mbg+n95j.hti qr304 s 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 lighw,qu;4)r g(c ,v:kd: y xbdr4oc;cu qtt rays do not actually pass through the image location, and would not appear on paper obdd:gcokr4t) ;, qy, vwr(4c;: ucquxr 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 ligh 9ybqr6nth80 kt rays pass through the image location, and could appear on paper or film placed at 0ky89t rh6bnqthe 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 virtual i6-m hfal2to8x v5m o8image?

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 r igf/h(d,nbv.eflection takes place on the outer surface of the spherical shape is dg,ibv /.nf( hreferred 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 wps0*cqcipb96x 0j6rinner surface of the sphere isb*66rjqpcx w0scpi9 0 referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the concave mirror is r, the focal lenlp-p .d j2cak1 *r7qatgth 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 axis, strikela 8x/dccjv7 4ge e-7ws the mirror'sjgw 8vee/a 4 xc-77dcl 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 fx .e2 b1+auhqv 8x*ef nhn+2iparallel 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, v 7 (yfu(e+jfx9b/ioos 73jgk crosses the axis at the mirror's center of curvature before striking the mirror's surface. f(+b y3i kf /gs7v7o jxoue9(jAfter 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 through th1f+74w/wwlji fcn a o+e center of curvature is reflecteo71w/f4i clj+wf+nw ad

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 the axieq/o3 mcix+8as at the mirror's focal point before striki /+cxiqme38 aong 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 t) j3wj k.n8dpzhe focal point is reflected8.k3zpd)n jwj

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 fora ;kgr2, tfmn/ finding the image position due to a curved mirro m fga,/2ntrk;r.

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-k2r*xgsrh; qd45rf q k6jgi2 a concave mirror, exactly 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 concave mirror's center of curvatur xeyg5v1re/ l;e. The image produced by the mirror is loc;eg vry/5l1 exated

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's center of curvaturkiz h,ty ,vu)5.k 3amn7q:: ref)jzdze and its focal point. The image produced by the mia3 .e :)j5 f,q,uzknrdm7t) ivhyzk:zrror 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 foktto6j8myf4v hw1vpi c2:f . 1 gp)w+ycal point. The image formed in this case tm+o jp kfv6tw2yf41 hc y8iv.p1:)wgis

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 convexm0 )uoe/a kv)3ri s:ef23 ee3pb*tg fg mirror, at the same distance from it as its radius of curv2t mo 0:e e)e)3aer*3 gvs/pib3gkfufature,

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 from it as its fogl*kfc /vbp eaf1m(+w5 ,mwm ;cal lengtgf(m1v pfkcwl,eam5 /b*;+wm h,

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

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

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

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mirror you see a q0 fbck4 r4m(koj0wc;z; gh0zmagnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (conve;f0z;0z ( cq0kcbwr 4mgohj4kx) 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 mirror0 binj9bc*)yq0m/sg uxd5od2 s produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

D. could be 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 imagesjff7tw:1qrw.t : *g zcnsh- pah+a.0 g which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror prod-g9a 6nnahh 0n6oqxd4 uces 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 which isvl27yqbbd 1xyym *flb0o/9ho 8l d+ q7

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 )r)rlxt --muhkca.t+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 positivm gq2jo:g5a,b,rd4hmy q*bj*e, the 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*nu6a/ uue7 sx ke s*y,)(zvys is negative, the image formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a positive o,h0n7oz9: nu5u it icvalue, 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 negativ4qm * 52xu1hsol2:etnxoock 4e 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 magnification is largjw;k-fz 6nsv ,er than one, then the image isw fv;z6 -kn,sj

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 magnificati/ed 70ez s (cm r9ul8e+u57 pl5lwfgydon is smaller than one, then the image iseuy5 ellmruw9 dgs+ zc0(5efp77 dl /8

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 zm9 +, r a5o tek*+my5iwjfiq7the magnification 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 fastesk qe37yjlp:a1 t

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substa;s 6oa 2mpogzau3k6jf-us3- e nces, 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 aug h./3* h71rwvo .tza*ty obde; z4ba 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 o-)f ;q-hswzvy vg g2,zts(m .yf diamond is $2.42$. This means that a given frequency of light travels

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

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

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

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

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidencsl/ 1rganv+:u e

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 medium is r4w j ,qnyyqz:9efracted

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 wa4b8q.x9 j:jz8btm5o4xk w5kb-t iym hter. The angle of refraction 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 travelingtdgig kr8 hqs)w145w(n9u :04dus ouc in air, is incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is barab;+n. u*az ised 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 beamxb+qe7 , 4dleep23mb lym u es321sd-o of light 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 lensese ecl 9ts:*p.(ybsmw.0i d7ra 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 ca8aewb+7. dun j3yr-qg lled

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 thmb*-u*2mdff44vxq p6z bwh fsh+*2 ng7uz-k e an 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 tu. (wsz8 *crmx re-c4nhe 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 ratedyc2 -lf51t*;6q +zrwsg dmwhn at 20 diopters, whereas lens A is rated at 10 diopters. The 5fnqmwrw1g; zs2*cy6dl h +-tfocal 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 axis of a thin concave lens, strike u br76gfv2tyo(wfc9. s the lens near its midpoint. After traveling though th g.b9(ff 7 c6y2tovwure 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 the axis of a convex th seanknv-t-/ e0kzmj() im -s5in lens, strikes the lens near its midpoint. After traveling through the lens, thia-knmj)ek 0i-z -svm( e tns/5s 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 fv12zq. lhbxc (or finding the image position due to a thin leqx 2zh.vl(c1bns.

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 foc8eg5cu88 da. , hgmla wg,.bjng yd94jal 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 lt c:2 )za/demhxj*,iu ength $f$. 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 lengt6jukca5-/cmj u;/pngh $f$. 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 length w f:pm3 al ec).(;d1dod f.bcj$f$. 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 tt /bha tl+.j*u(ys+s *ia4; mekiyvn/0+ hpifocal 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 betwea, *pfaqijmhv7dh/6*y +w5jwnfi,q. en a convex lens and its focal point. The image formed iq.hy,/w dn+6 v *af i5iwpqhjjm,f* 7as

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 co8u49g2x-v r.qnu gqby1juqt4 ncave 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 you see throug,qc 0njk7k 7 ws:+zy0mfus j; t4rr:dqh 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. B-d9f,z/kzi0dcx n*vk etween 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 position is varied with respect to the la kivn /xdkc9 zzf,d-0*mp,

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 fsupnn11 gw0tg/ :y o i;r(vw5gocal 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 place5 vpfzzr8dii gd .(fh4s2as/5w,g ;p yd in contact. If each has a focal length of 20 cm, how would you expect the combination to zards(5f ,pd5;s gvpfi g. ywi /4z8h2function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. converge.

B. diverge.

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

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

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an angle of incidence 4.6 oi2z ytivw/u1upt of py.izu6u1w 2 voi/4tt$52^{\circ}$. 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 t8wj bam m:7v+,tw0dhb -ms2kmt 2ff4plane mirror. The image formed by the mist m4bmdff t:wkt0v 2m +w-8a jhmb,72rror 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 dqi w:ev7kn/o g 2 o2:z8jf:xo0.75 m in front of a vertical pla:oi:jvqon8/e 2xk2o7gz:d wf ne mirror?

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 appr4pd-tgn iv4w7 oach a vertical plane mirror at a speed of 2 m/vgti-npw d4 47s?

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(a9n h:n dwwnj,2 .mh,ba e5br5it1cs of curvature of 20 cm. How far from the ib dc(n 9a1najh,52bns,ewm:h5t.rw mirror 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 radius of 20 cm creates;yg,:w5*6ss-sy ra3rfzw e g0ceec* b a real image 30 cm from the mirror. What is the object di;rrw zcfys5 g*ewc6yes *,:eb a-s 3g0stance?

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 fro wphp,lx1s.84 hgq r0hnt of a concave mirror, and the image is 3.0 cm in fronth1 pl.xh4r0 h,sq8 wpg of the mirror. What 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 u+-ik (- b/xw so+ztixconcave mirror with focal length 3 cm. Where is the image?s-tiw( k-b/xuoz++xi

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./iz3one9x.c e:rhydo( + a) pd An object is placed 10 cm in n9)d zora d +ox.e(h:eyicp3/ 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 mir8hv8 *uq qplx(ror has a focal length of 20 cm. An object is placed 30 cm in front 8l huqv8(p*xqof the mirror on the mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a sx6*( u+ +aqtcv d;pqlconcave mirror. The image is 4.7 cm tall, and 10 cm from the mirq;v+6p*u(a csq x+dt lror. 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 lengt 4;0fc,* faiam-npc/ cs n(xomh 20 cm. The object is 4.a p,nicxnmc*40a/fcmo(s - f; 0 cm tall. 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 cmpycfj/(4tch , tall. The image is 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from the mirrohfcyt, 4(/cjpr?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image5cd2xou.abe2ow 2oa * is 4.0 cm tall, how far iso obe522 dau2. cw*axo it from the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal length 20 cm. The obrm - es/+x/)sa y6p lk81qgvfuject is 4.0 cm tall. Where i6y1)sgm+ s 8px/lkrq vfa-e/ us 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 front of a cosmetic mirror (concave mirror), 2/a .ni foxnw;dv*t 3gthe erect i n x.*vito/nfaw 32d;gmage 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 cmp)lxdo y,fk3vwg + :3oncave shaving mirror. If the image is an erect image 1.5 times asflmoxp3+3gy ,:k)v d w 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 concave mirror with focal length 5.0 cm. Wherekacub1d*v5 2 4ezo p8n doxn 8-3,ajmk is the objek831d5nma 4e cd p o a2*j,zn8xoub-vkct?

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 mir e 2v2(k3pzy-hcq(b - dv(cmztror has a focal length of -20 cm. An object is placed 10 cm in front of th- 2t-zbpeh2v(q c y(kcd mzv3(e 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 focjx+wvj91lh t: al length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axi+ lx9 t1jhwv:js. 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 a convex mirror. The image is 5.8 cm9rur, +izu8wxbgo p (we5 yh7, behind the mirror. What is the focal length of the mirro87 p xw5zb,uhg +wrr9y (u,ieor?

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 t0 aawns+c*u sg- 3wu:ts kl:q9vh)r1tall, and 14.8 cm from a convex mirror. What is the mirror's focalnt9u:w+krtg q: -s s30*ulc1)havasw length?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, what is the speed of lighw *wal6ggg1 c3x(ptae *,ks3yoeo5-lt through it6*o 3wxes -o(1,t3akelg 5 cglwp*agy?

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 aw y ua 1nt(udnvn8ji7 o)-/y*sngle 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 frz4x gauwr qwwd; 3udit. :2/h,om air at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air tpon r3.;8k tm9a,snxwo water. 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 am3mgvzl395 nand evenly over the surface of water on a windless day. What is9a3 gmzlv3 5mn 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 benea mvjt8(-6xoxi zqo9:c th the surface of a still pond of water. At what angle must the diver shine a bea m6 ocj8ovt(xq:-9z ixm of light toward the surface in order for a person on a distant bank to see it? (The index of refraction for water is 1.33.)

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, strikyse 6l;+s g;yxjehp( t-7m1bjes a plate of transparent material at an an tylp7g+-jxb1( s6 yhs;e;mejgle 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 ix/+6,f cxvvw: yr,hw 4 gp2dxzfp5i vq+. k,hair is incident on a slab of transparent material. The incident beam and the refr5vh,+ 4i2v xcyz x f,piqx+:fwh/,p. 6vrkdgw acted 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 refraction of 1.46. Lign jbg (w4 apf (uf/z,pxslt4:/ht is passing through it at 4gx ppn4 lsfjw(,/bf:/tuaz( $53.0^{\circ}$. 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 agk8s,pzvaell4 + 0s iq4 2a0jnngle for light traveling from crown glass (n = 1.52) into wazi 0 es 28nq,0+kgp4allavs4 jter (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 of5/h6um+11lk on ; yy0luuq1h16cppiwi 2g yyc 1.50. What is its critical angle of incidence? y/ n u1 poclumhi60+u wk16y52g yc1qyph;l1i

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 pl5e1oy:xo . flr u:ner0astic with index of refraction of 1.50. For what angle of incidence will light remain within the plas ueore5xf0:rl y:.n1o tic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is measuredqzzpee7n:tql ljx niv3 083+) 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 fa 0p.c.re s,6ob).wqfnfi ky-rom air at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 meter long and has a diameter of 20 m hl0qk 9h 2z70vmbtj3cm. Its ends are perpendicular to its axis. Its index of refr9v7 tb3hqh0 lkmcj02 zaction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in+xr3uj:6.acqz6. nyop :c xkakhbc 5o6w,. bc front of a 20 cm focal length converging lens. How far is the i:qc . uwyzxc ahxc.ork .6b:c+k6a ,6opb53jnmage 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 a converging lens with focal lbqk /fh97 zvq/9.hj ilength 4 cm. Where is the imageqfb99z .vi/k h jl/hq7?

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 converoph ;+w)e 7o(t ikyx8ji swym0/ ssd:/ging lens, and the image is 4.0 mm behind the lens. What )spwo+ ie/sm;os7 0/yxiw(: hkd8ytj 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 convs k5ewx3 c,hhh:3ps6ierging lens. If the image is 4.0 mm tall, how far 3: p,s k xi5hhhes3wc6is 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 froo5z v8djxx7. .(glrqqnt of a converging lens the inverted image is half the size of the object. What is the foca7 oq5(.vqzj x.8rxg dll 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 lengthl3jf-:xqt8ky31o nxxwe ( oq 0 5.0 mm. Where is the qwxot- ( xy3jq neo:lx80k13fobject?

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 convergiln9:qfw 2iwx 3 lwi0l,ng lens. The image is virtual and 6.2 fn,l9w wqlili0 :w3x2 cm tall. 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 mms;v7pl p2c 2tqp1kl3g3/nz ggvdc8- u from a converging lens. The image is 4.0 mm tall, and 9.0 cm v/g 3sclng7 p;8zkpu2v lq t3pc2gd-1from the lens. How 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 cm from a converging m1:0o x 3juhdycv z tq88sccn;qk8f;2lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther frov8k mtyouf:zc1d 8 cnq03q s;j8h;2 xcm 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 convex lens. Theyd.;nmg spkjy-l)cc hcz1s;*rdmz(y 95 w n*. lens has a focal len*;1m.hygn;(s9 .j k d*zl wcys-nm )yz5 pcrdcgth of 10 cm. What are the values, respectively, 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 with a focal duss *km3 p/ i:y yoy9mk7(me6w8rjj 7jn,f ;ilength of 10 cm. What is the image distancok;nyjjkme isw /r du:679( pimf 3*8,7jy smye?

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 ofhywi:x iw( 3*d +bu:w/h;uf qzb7; mzt a diverging lens with a focal length of 10 cm. What+t(m3zwqhhf*yz:xdw; /b7uu ;:ib wi is the magnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tal, +)/rd2jxc+z4tyexce qyi 3yl, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How tall isz x)x3c /jirc+2 4qy ydte+ye, 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 front of a diverging lens. The 0pbeov; c- )dpimage is 2.5 cm tall, and 7bo;v0p ec)-dp.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 virtual imager slea6b.s7e/ forms at a distance of 50 cm from the lens, on the same side as the object, what .b/ l er6s7easis 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 objecw7 pgw 6uo-c 7ki.byg5t be placed if it is to form a virtual image magnified in size5w7pggoi 6yuk.7 -c bw 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 30cnq7 t.r 1ypcevy;lc53 o 1 hqd:0pgn5-mm cameras, must an object be positioned if it is to form a real imag5nqyeccpy07t:0 .qnlp;1oh crv 31dg e 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, are2xwezmi 616b8hfk o3j 6p iu+h placed in contact. What is the focal lenu h6ke8 mpb6o3+z2xf 6iij w1hgth 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 curva *qjbjob29(l ature 46 cm, and is made of glass of index ofo j(*2q 9jalbb refraction n = 1.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) has a radius of 40 cm on the zke xt0q /vs,3mkhz* a+t4n j;front side and 30 cm on the back side. What is the focal lq3*t,0vth z j+zk k;ex4n/samength 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:lrjju6p(u u2wt: 7e9fnv:n v piece of plastic (n = 1.70). The radius of the front suu 72tn(vrunv:e uwjlj 69:p: frface 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 of glb0.gkt+l3lti ass of index of ret b3ilgl 0t+k.fraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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