Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images bbm.fg/ 9*(d6q91oy uruwn oewy mirrors and lenses has been successful describwrfo m(9*w bu gn uqd9e.y/6o1ed 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 incidencelvcmzffvl04 *f ,v:mvu w24a 8

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 whichxz; e2absk zu2).(ruq3 cd9 lv 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 0o*dw b,1evoiimage that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce imi5 )1uo*q3 xia mk)jxjages 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 actually pass throuz27mi6 c1c doe2eq3engh the image location, and would not appear on paper or film placed atqc6me o ci7d ez231ne2 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 lw*e9h)d6,ka fugt sa- ocation, and could appear on paper or film placed at the that location is r)u9 , wg6-tk*sdfahaeeferred 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 imag6bg9d :.:8ch plac nide?

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

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surfslg26rqo5mc):dt tb* ace of the sphericl b t6tgs 2d*5o:)rmqcal shape 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 wh j. -k* mxofx98*v jx-bxy(zubich reflection takes place on the inner surface of the sphere is referrzubj 9vo-kf(jmx. b-xyxx** 8ed 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, t+zu a9xdc no1/i;4xe lhe 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 axis, strikes the mirrorc0fp+vy, otd wvb5c *x7u8og52whms 7's surfwy fo7h*mb sx7t c d+wcu8,5v vpgo052ace 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 m l- 3*t .q660fzfq;87hxaya+6 aucxqjycvxr jirror on a path parallel to the axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely d tvbw wqveuez )7j *gf)3;0e)to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection );37j*)wdve0uz fe qetgb)vw, 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 throughz7 s).h6oo.9x2 armrc5yisl n the center of curvature is 769h.2m. xolz)srai nycs or5reflected

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, cr3 sjmbj4ly o 433qe)kk/b-ajrosses the axis at the mirror's focal e 43)qr-3 / bjjjybsl4k3 omkapoint before striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

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

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

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the f0xz t zt2 .6b1oemddiwyg)q+d*h z -m.ocal point is reflectez2gqmzeti+. *wz tx1 dd0om y.)b6h-dd

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 finding the image position due to a cuz3x9*nd 7 itl;2ffmvcrved mirror.7*v f d3zn2ixct9m; lf

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly at its fgx:(ioq klg76 q2wj-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 c)v.vffgjf fv0mw: un7w2*q- boncave mirror's center of curvature. The image produced by the mibv0:7wvf* f2n)wvu f-mgjf .qrror is located

A. out beyond the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mi-qud+q0e,2 flhri;yurror's center of curvature and its focal point. The image produced b ,;2uqiuyh-eqf+l0 dry 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 situatedlkerm63(s 9nh between a concave mirror's surface and its focal point. The image f( k 96emhrl3nsormed 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 sa-8/ n fegfj79zu :/ hcq(wf7xfysy+c pme distance from it as its radius of qf u+f:j pec7wfgsn8f7y(9z-y//hcxcurvature,

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 distanceo n;g.pj a-p,o from it as its focal leng ,p.goap jo;n-th,

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 magn kuft -q1vu.v5ified image (a great big you) and sometimes you see a diminishef-q.v1t5vkuu d image (a little 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 produ5kx+m 7 dj2na 6l6swmz djb,;jce 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 pro,*brd offeu+ (h5 ql+4ye9 vinduce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror proda9)h4j 3u 4(nww gedkzb .7sqnuces 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 mirror2pme azau1f3w.i:-z v 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 fonrkf 95nrjd.4 r 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, ;at*/g4lx.pjai1wf3z0ds rr*t oii,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 is negative, the image foxb.4hv8(z6 fnb4qisewt4 6 r mrmed 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 pea/trd3oyq ;1sp43 l xpt2 f2eositive value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is aamev;kqt k.99 negative 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 larger than one, then ;(ok:4zfott c,ddw :yrsdupm7 e/4d2 the image isert(d, mpu ts/o wydzkdf7o d 42;4:c:

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 smallero.ic rfb i7 /u.3xhc-v than one, then the image i i3hcx-. f v7o/i.crubs

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 thekgihk lcqry 09(f4 ,wk4nk) 2h 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 fastestbg.f* k mz/7tc

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 mato1nhewy d .,u5erial 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 o .b1z8e p d15:uxznlpfne for a medium would imply

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

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

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction .u 6bbn3320ud(u cwt jkmn y5kof 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 incidence1q:qhx4h ,y ./ 2spyoejnte0 u

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 dens:8kcq6n s;ar her 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. k/e81.bzenf e 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, whicw t.qlbo6 voft+t0 ,ky )+wtu,h is traveling in air, is incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber osb27 dtixdo4ase-:j0*b zh :kptics is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing rmxf ;o3d+o2( xbfzo; 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 9umoubjz89a( rf 91jnwork 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 ca:h:js *ptw)w 6ow+ nqylled

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 edgetj*a7vae5v f1 s are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker at the ce,e wgk 6 oawd91 stg 5yv7;u1aj/vvhs0nter

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 diopters, whea(ik jl:x-:o,i m 44t m)scqbmreas lens A is rated at 14-qm b,j:m (k mcxal:s4o it)i0 diopters. The focal length of lens B is

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

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

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to thdvg stb*mp + o:0fu./he axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, of p:bu +h.t/vm0*g dsthis 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 parallea+r px*l1 )ww3 ltyea/l to the axis of a convex thin lens, strikes the lens near its midpoint. After traveling through thewwlrl/*atx )3e+p a1y 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 1bsi;71 w9bnm tf4j guimage position due to a thin lei;1s7 tbfjb9 4nm1wugns.

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 lengthhvqgwl 9scsmp4 16 l2)gou3 4y $f$. 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 fjl565v lahni*6 e)p5uc y3tfoocal 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 focal leng37j+oe)g-0ttcx tat bth $f$. 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 lengttr*w )6ujuafbicbqz5 )lo98dax598 b h $f$. 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 lev :/ 6kzh eati4/y6srf*zs e9sngth $f$. 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 betwlo0 q.m;/esqu1)zr mv een a convex lens and its focal point. The image formed io uvsrm)mlq qez0/. 1;s

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 concaveqs,n-(xrr5b- yv6d :r d9hrgv r1ev5c 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 through a magnifying glass d7+l zps7 *ukyis

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 .kyjgbii0+f +(dscpwy *(ha8a screen. Between 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 v.(pyj yi(kf0adwh+b8c +*sig aried 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 leyze sd56 1mbm6ngths $f_1$ 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) le nw2- s,bwhjbs 6i3r.wnses are placed in contact. If each has a focal length of 20 cm, how would you expe32rwwn6 bwss, b -i.jhct 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 surface with an angle of incidence qg1ees1o e/tm8woq-s/noch :w(+ jj 3of c(w3j h8 oqen e:-s1/s/o1g+ qjtwoem $52^{\circ}$. 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 pj :f;e*. whng-tnx3axlane mirror. The image formed by the mirror appear-enjx*.n hat ;f:xg 3ws 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 (4/znvgwn bnn8 /jt-om in front of a vertical planenbn/vw8/t - 4 ognz(jn 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 whe+ 6s*dtm) q 2i*;jz ob 0uedg1qswl5nun you approach a vertical plane mirror at aqo*m2li 5su ;e1 60w*q +b z)untjgdds speed of 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 3ksh7pn1 klgi2hb - w6cm. How far from the mirror 6 -w2h3ks1kbnlg ih 7pis 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 cddr3ex (x ve;8m creates a real image 30 cm from the mirror. What is the3ed(x;dvxr 8 e 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 the im+ bo cnl5,hohg4(6klpage is 3.0 cm in front of the mirror. What is the focal lenh,on+lgbpl56o (k hc4 gth 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 focal length 3 cm. Wherea5s-o6 qzf8fl;- (ips t- zr9ujzrgx 1 is the 8u9 i-zag--rzfptqozr1fj6x;s 5 (sl image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. Anfi sp lq -t;w3k-4j(yz object is placed 10 cm in front of the mirror on the mirror's axis. Where (f i -;3 z4y-jtpkwqlsis 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 mirrorkbc )tzllp f zv3y:x4xo0q2z3 jlt)/) has a focal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Whe4tz/3z)p30l)t c2 oxz j:kyfq)l bl vxre 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 frok5lw,*g 7 -7kkbxp dr(+ocqdkm a concave mirror. The image is 4.7 cm tall, and 10 cm from the db ,5prl7wdx *k+cgk o7k-k q(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;py+6(dl 4 irt5q 4hmnj hgwa9 of focal length 20 cm. The object hq yhn(jm 69 45t;iw4dg+raplis 4.0 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 cm tall. The image clq jqw: 4.tr/is 38.6 cm tall, and 14.8 cm from the mirror. How far is the o./q4 tqr lcjw:bject 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 con n)fr7z5ldo8/ .6soec8uoz drcave mirror. If the image is 4.0 cm tall, how far is it nof6c ru.zdlrd)8 5e/ooz8s7from 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 ci. qu.n;v+hux9ly/jz,noydm mi l3: 4m from a concave mirror of focal length 20 cm. The object ;u+.3hdxi vn4nym/zq y .iul ljo,:m9is 4.0 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 front of a cosmetic mirror (concave mirror), thjawg ( sq)aa wi/mpn5m8biu8)93 t(0dri vru7e erect image is twicgrjiq)s/auw8t na5wi d p( 9m7ram3)v0u(b8ie 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 frl.voe6 db48 z1g h+5fo1fcp* ve0ohmwont of a concave shaving mirror. If the image is an erect image 1.5 times as large as the o5z*e vl4p11o.o wof 8gb6 cmfveh h0+dbject, 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*o+ u 3qawno chm98d+g 5.0 cm. Where is th3oo* a9+u 8cwg +nmqhde 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. An object is placed mhs8 ez5dy.;5pxevr0 10 cm in front of the mirror on the mirror's axis. Where is the image lormpsv85 z d5y0; .hxeecated?

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 m9jcbr(th1yi m5:) i(l8e vduv irror 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 the image (1 mbji9u rhyd5)vc vlit8e(: 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 imagdw9i(sh muqyzgp/74py tdf p2831 )a ne is 5.8 cm behind the mirror. What is the focal lengthyf)pw/g3zpdsqti24n19 8hd 7u pa ym( 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 contc,4r3(j d:)urxlhsn( jq :sx vex mirror. What id:s t n(jlqh ),4jru x:s3xcr(s the mirror's focal length?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, j)wc 6gvt) (mnwhat is the speed of light thrountj()6c w)mgv gh it?

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

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

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

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

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass interface at wbk;87cp awz3 l-pjd/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 airbu, z se-6uxh( h1sc aih6e+7t at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming ray is at anfq ctx(i wjka512-nll3;hx (n 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 cmosq3z 6zk47knvw l4h. thick is spread smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle of incidence oq3z owk.44nk sv7 6hzlf $45^{\circ}$ 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 surfa+ b5ug *olse4y.l )dmjce of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refraction fj+sl ey4.m)b 5ulod* gor 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 materiatnl( 0vzrp -4*oevo,w l at an ang0oe rvzwp olv-*,nt (4le 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 tra*-s3na ng udu969cv lcnsparent material. The incident beam and the refracted beam make ang3gccu 6-un*a dvnl99sles 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 inzckne-m 4sk f;94c-lklq+t ,a 5+g rapdex of refraction of 1.46. Light is passing through it at ksnpz m l4kql fgc;t- - c+ea,4+a95rk$53.0^{\circ}$. 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 anglsy a6zl7ed ,,ce for light traveling from crown glass (n = 1.52) into watal,d,6cy e7z ser (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 ref1pna;x/ w,f5wyo- w*/-ivg gzhdif8 tb7l:llraction of 1.50. What is its critical angle of incidence?db zw-:f-a l 5 tnovwxg py*;g ,8iwi/h7ll1/f

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 ofg i5m1 xn;gws7p8ay q1ik1-pvub2 6qg refraction of 1.50. For what angle of incidence will light remain within t1i1bx6sn -mqp a u7wp5g2;ik1gq8gvy he 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 sub0bwr 9/fak,gvxmf6 /j stance 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 aukby8 8xvdr+88 k:ooair 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 mm. Its bb-8 l cavzlihm6g *y-b:7;di8gub: ga vo8q7 ends are perpendicular to its axis. Its index of refraction is 1.30. What is q :dgz8-bagymvba7h8b87ub lc g 6:-*;iiv ol 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 front of a9ut7dn sfg6h +zcli+r7auc 5 (7p6i)gb 3dykl 20 cm focal length converging lens. How far is5r7+y+ipk3cu 6id77) 6hgafgsllz9 ( udtbnc the image 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/sg4,j5hx(7y/cc + es ureeig8ze0xs a converging lens with focal length 4 cm. Where is the imag5ue/ssz4xce7+ x c s(g80jgyrhe/i ,ee?

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 image ww*a bs7n99 ox2ot5;lq6d2gxr fmam6is 4.0 mm behind th6t 5w97lfmxg o 2rnbm6*q xaw9;oad2s e lens. What is the focal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mme , o)9enemp d)- gnmf8t.ue(a from a converging lens. If the image is 4.0 mm tall, how far is it- mdgfe.ato)8ue , (9 pn)mnee from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens thalc4f+r m(cu* e inverted image is half the size of the object. What is the focal length of tacmlc (f+ *ru4his 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 ob87 m48cmeal of a converging lens with focal length 5.0 mm. Wherb 78almmo48ece is the 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 +zzb3 :jaufsaie *-r1cm from a converging lens. The image is virtual and 6.2 cm tall. What is the focal length of jr-1sb ea3 *:az+ifuzthe lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lens. The image is z jx(v-yyl;z+/6zjn x4.0 mm tall, and 9.0 cm from they yjv/lzn6+zxx(z ; -j 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 fr1 46fbql optw+om a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is64fqo +tlw1p b 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 ofg03 k.tovmh: i:zziz pf2a6 q+ 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What araf :i06 hz3gvtpko2.+ zqi:mze 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 ak v 5lh;-a6phet 30 cm in front of a diverging lens with a focal length of 10 cm. What is the imal-hhv5p a6k e;ge 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 divergivqe z5c2ogxh h9b sj6,u- 2.csng lens with a focal length of 10 cm. Whatoqvez2 jsu5 xbs9hcgh 6.,2 -c 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 tall, and 4.8 cm in front of a diverging lens. T*-(e )u l9 mw7gyilbovhe image is e( lu*lo -yib9)v7gm w4.0 cm from the lens. How tall is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in front of ki 9nbm0iti/pq 6ui4 (a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens 9tqiipn/m0ik i4ub (6. 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.xz36.dj8i enh, aov. v If a virtual image forms at a distance of 50 cm from the len j, x.v86 an3dizoe.vhs, 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 object be lkr0uw38sv4 r5 kvkl /placed if it is to form a virtual image mag35 k rr8uvk4llks v0/wnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length lens, such as isz2vxn q8sg 3/k used in many 35-mm cameras, must an object be positioned if it is to form a real im2 zs8k nqx3gv/age magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are placed in cont9kpv,5 zz6 hogact. What is the focal lengt5 h69vgo,kzz ph 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-) * z;t.uq7 zx50jqr1dtdou onconvex) thin lens has radii of curvature 46 cm, and is made of glass of index of refr7xt)qo;rd5 zjot*0zn 1.uq du action 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 401 l-aqtmy 4ar2 cm on the front side and 30 cm on the back side. What is the focal length -am2yal 4r 1qtof 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 b8lz/7d3i b/zra nto5-j*lqltj0c z7of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length ol j z-a7jdqlztlo0nc3b7r5 / b*tz/8if 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 7zsos r-vkcjj ;.3+pqypko 1,tmuh43 a focal length of 40 cm. It is made of glass of ind+3tys4h k; 1mz-p,jvokcs3ru .op 7qjex 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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