Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images p;v7sbx,pqcb-3x- )zi .jc of by mirrors and lenses has been succez xs vc p-7b-pf.j3bq;,)oxic ssful 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 incidenc+0-j/oae+k o byjf2fl1iv iu2e

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirrors work is8 xbydvr /9yl.

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 lh8.oxq) +kbzl:8 aiman image that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce images dhdrvig(n5w9ox 9ff6 kwki(6 ver74,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 iodd+k*w /dv (9f5ivyjlg3;b/ yshn(pass through the image location, and would not appear on paper or film placed at that location is referred to ag3h95y/ d f;w( +nodvi vsbi/yk*jl(ds

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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 rai/y148r 89 pyqdq2d zpajhi)g ys pass through the image location, and could appear on paper or film placed at the that location is referre4 p1)2ydyip d z8hi9jag/8 qqrd 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 virt7yb9 y.dojn9bo* a l+rual image?

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

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflec4,g uq7iogs ,yog 1ise xmt 9n/2(uyw*ew kz67tion takes place on the outer surface of the spherical shape is referred i6mz 74x q2,we gw /eognu(,ssoi9yt71u* y gkto 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 4 udu0*2sl w48v ewhnbwhich reflection takes place on the inner surface of the sphere is referred to 4*h eunw0lu284 dsvbwas 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 curvaxfu-m zbp u-8: y3v8lp98v rjature of the concave mirror is r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror's axis, strikes the mir: l+ w1k9j/qcmbfqx1;(yjh wuror's surface;/9+hk1yj lqum(fc wxb: qw1j 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 is refls 7j1vqy),dj l-,jqmhected

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 obliquelu0g/,l ; g(5gp+ +o gu6uqw.exxlafgxy to a concave mirror's axis, crosses the axis at the mirror's center of curvag;fl+ 50xug ouwg p,xqg .6ug/+(xleature 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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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the center of curvatureqv6kprv5m.:7 3r qcz m is refler rq7mk.3m:c zv56q pvcted

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 surf e . imds13lnxea23ob4ace, crosses the axis at the mirror's focal point before striking the mirror's em4nil12aox b3e.ds 3surface. 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 cjol,yafbe+1u,/7mn8f n7zd1 )hw sih oncave mirror on a path through the focal point is reflecteho)zf8h, m abnslfyj7en,w7i 1d1/+ud

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 tol*vs.+lg i)y*7+qg lsbqlam l*5ed/t a curved mirt ilqsqms.)v+*5l l*gdygb+e 7al/l* ror.

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 m my3-jft0vh:dj o2k6c irror, 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 ln)5 l/*n - wcj5omzcvmirror's center of curvature. The image produced l /5nc m zno5)jlv-*wcby the mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirror' 5j.nxq1ddg0 vs center of curvature and its focal point. The j. ddx q51vgn0image 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 concavgmk i-pomnb5s,6 fya e)r4r:;e mirror's surface and its focal point. The image formed in thiapy m: -k5geb;n4 im,6rosr) fs 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 fj)t 3ezpy;)h the same distance from it as its radius of curvaturey)f; )h3jpzt e,

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 con 3oz:waah+ ;xygrg9p88du) mivex mirror, at the same distance from it as its foc39gx+)g: hiaword8mzu;8yp a al 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 lo 8 c4qpbn(;:me6maoes*ff-z yok 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 ofp 8qyc *a;:4oee z s(f-m6mbnf a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrors produce images whiche669d0q.hoby i1fm;6o; o dmlg:v ybl

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produce images whnj6 f(3tqppy79 nkbf 9 y8qi;kich

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 produces na;sk8- ,u me,rjwrbir)5f g,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 mi +ymp j-hm cem 8cm)x:3av 2ahd--ijt6rror 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 a mixz5: l. n7)o1qunhphxo qh0h 1rror means

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, the image formpioq uc+wj:k2o-69 jued 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 negativ-rh2hiu u-6ice, 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 isx sz5vw x(8yay .wya:3d byr/+ a positive 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 a negative value, the image isxrgs,mic: ninb 66q8 zmv;2t;u vrj57

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 thc:.oym4 rdq; v 6jheg*zl5qc7e magnification is larger than one, then the image ise4:cvj5*mczqo dy;hgrq .l67

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is smaller udjgn z 9g,.+4lj7 h jlnf)ww7than one, then the image i9j7whf+ z n j l7).lu,dgwn4gjs

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal tow 0u t4fla/9yc 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 fastesm zn2x-jyq;pa m0r5 o:c+8:hbrf e4fat

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 ma-g.nh u9-q-ixgjqd) j terial substances, the index of refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a m xl2 sd1 uya96g)zphu a(1osb/edium 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 diamon+e,do 79 ixj4my ,rkz,c6ug xyd 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 incidenc mzsa9w macg*)q z:+ jt,m(ve)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 dens2j5t b(;s1e n*fz 0sdc zwc)weer 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 ayu(; 1,es xw +xfamxho8l sl8:ngle 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 traveling i4rjwe,;bv0t xzgm8 a68j;gl i n 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 fsec,/ * au5mvmiber optics is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light o) p76hwhcq+/5tf doxpassing 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 leu)ax) l san 62ykt5)yodo93apnses 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 an55ivtm gu8 :nt 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 ce4bwqrk(ic p8nz.*j 7t z//rtnnter than the edges are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker at t9wl/8hs;u o ,g/drg + )ai,ipzvg *qjvhe 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 arekq2a* htpne52;ozryha6 wh/ - similar except that lens B is rated at 20 diopters, whereas lens A is rated at /6z 5ak;qw ny aeh*2pho rt-2h10 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 the axis of a thy dh7n q* vye,p6x*fs(in concave lens, strikes the lens near its midpoint. Afterp(f v*yd7yx qs*n,he6 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, travelivz110fa/3awouh0oq5x1v c q h ng parallel to the axis of a convex thin lens, strikes the lens near its midpoint. Afo01qa10w3xqf 5zvh uh1 o/ac vter traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three j4j oe jegl5f,7m5m)xrays for finding the image position due to a thin lensjm ,)exlo7jj 45f5gme.

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 mc sshguq*ag69;j d o3z 35a(tlength $f$. 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 fok; *ddxdz9) jz )eg+ mqf1*ixecal 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 mnjp t;jzfx v( 3mxdel;(v,-8 length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal length1lfkyaxip diabg +:s5+,r)1+ x(x qjh $f$. 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 ej mb0-ewpi.t q0p7p-sqvz k 3tq -)x4length $f$. 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 colnc;h: :m;)9gfp+ mkk5uhgw8 hc,whlnvex lens and its focal point. The image formed f;:mml kw8l 5h:+pnch;,gcgh)h 9 ku wis

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 concavef5fi/bkok u);i- /t u6tw7bf txw9z-p 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 stamic0j-uahl m .3p you see through a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screen c t+; pot8dhw0is 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 +t hdt0c;p8wovaried 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 f 7nc od-:ht-frocal lengths $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) lenses are placed in contact. If1ssc 1-wzvgk9nkh.kj /lv+8 t each has a focal length of 20 cm, how would you expect the combination to function8cz t+jk vg-hlk.v9/snk1 s1w?

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 cc/a6s 5spzbn 9ww+ :pa plane's reflecting surface with an angle of incidence of p59:bn6w/sw zccp +as$52^{\circ}$. 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 tav omgq*re2 *hnm245 front of a plane mirror. The image formed by the mirror appte v qr4h*a 2gnomm*52ears 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 st8nlr;tlkxth ba0h (gn;: ,b-s 5be)eyand 0.75 m in front of a vertical plane mib;yakt) b ne:e;hsl(5 ,8ngb x-tlh0rrror?

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 yourbixmwe5g 1zm;l,+8h m image when you approach a vertical plane mirror at a speedm ;h5e,l8mw zbm+i1gx 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 httt-9lm r,f5h3bq3 zl opl,q,as a radius of curvature of 20 cm. How far from the mirror is the focal point loq-9 lf,lr5ttzq 33tlb,p mo,hcated?

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 radiun.zipq x-oa b4 bg o6-.*-fh l7rv5vdhs of 20 cm creates a real image 30 cm from the mirrorb - 64higon vflrz-hp 5bo..va*q-x7d. What is the object distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirror,j , 1 cbf4e-i-tp*s*ohnn y0zs and the image is 3.0 cm in front of the mirror. Wjeosh f0t-ns4b*ziy*1 ,c-pn hat is the focal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with fogiaip-23k. pl cal length 3 cm. Where is the 23a pik.i-lgpimage?

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 object isfzk /ve cc.04a placed 10 cm in front of the czc. efk/v0a4mirror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 2 jnm*fw -m:e58 l;ta0eqpv/mi 0 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image mme l:nm*wjvt8ieqpa0-5 f/ ;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 concud (5zv 5ol4lsave mirror. The image is 4.7 cm tall, and 10 cm from the mirror. How tv4louzs 5d (5lall 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 mir4x-z pw0f1hc((chg xlror of focal length 20 cm. The object is 4.0 cm tall. How tall is tp4cwlh1g (- f c0xxh(zhe image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tall, and 14.8 cm from the mivzp3d8c8x9 3w /q/im r7yvej hrror. How far is the object from the mirrozm7 wx3d3qv y/8ri e8 hvpjc/9r?

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.j su1lh yi6 z0m4zh9 khe2(hc is 4.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the mirrkmz1u( l 2jy60c. sih 4hehh9zor?

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 froj,gcux ;*ltg 8,s lwsf a.5 lewl1/cj6m a concave mirror of focal length 20 cm. The object is 4.0 cm tall. Wher ,llj6c5euawgjslcgw sx.l/ ft*1, 8;e 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 co)nc3rf bw 87ju3l 4tp1olk 7cksmetic mirror (concave mirror), the erect image is twice the size of the object. Whfrc nl t k olp7133c4jw7b8u)kat is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a concave shaving mirror.n82n u ),ov *a 5gv7a:bo9slg+lru uxw If the image is an erect image 1.5 times as large as the object, what2g9a,abuwn l8r: o+ g57vuos*ulxvn) 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. Where m-+tzq1r fqp;is the 1r;ptqz+q- fmobject?

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 ley.pq-rqr hz8y,i -ve 6ngth of -20 cm. An object is placed 10 cm in front of the mirror on the mirrr8h y-.eyri,pvz qq6 -or's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object io*s1 xrz 8,kyhn2t9bg s placed 30 cm in front of the mirror on the mirror's axis. Where is the image loot 21g*,rhz9nk xs8b ycated?

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 behin- 21ft ) zhyblbfc(oe n v.d(nty;z3m2d the mirror. What is the focal length of the mirrorn)ld(;fetz 3t(1 yz mb. cvo2f2b-nyh?

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, andddwp: )q k u/+lsqdumie*y;8: 14.8 cm from a convex mirror. What is the mirror's focal ledk+ m* /ddlw;es)qq: p8u:uyi ngth?

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 d47o ,t wh1mhl4il9qcis the speed of light thri74 twhlhd ,1l9cqm 4oough 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 issn 09u-oq4hhb incident 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 substanctv+82lg /pg8 hzqwyq 9e from air at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The .kdvvo0dli()0nqm q 1 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 s,y4fjya9. cxl1( qq vw) u+ogfv1-x om83zstg moothly and evenly over the surface of water on a windless day. What is the angle of refraction in thxtf f-lmyjs9 ou3,wvy 1ga v4c q8( g1o+).zxqe water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a still p9mee uuk(kd09kh( 1naond of water. At what angle must the diver shine a beam of light toward the surface in ohken k (9ed(1kmuu9a0rder for a person on a distant bank to see it? (The index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a plate of transparent materiafj(hj:rmz**i pn 8p8n:b+ duzl at an angle of incidence bz8zm: j*pjn (np:* 8+rhuifd 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 o3 nvw3 h-qk,omlcu+jkh 8pa*2 f transparent material. The incident beam and pm3hknhq 8 2+-u kojva3 *clw,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 in jvef.pw/qp(g atsr26 a k5zrh*u--h 8dex of refraction of 1.46. Light is passing through it at r hq5f-pzjg*/ pkr-6avu t(8sahe2. w$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light traveling from7 * po,hr+lp(i zcph.w crown glass (n = 1.52) into water (n =w,pz*. h lpcphi7+or( 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 re+*b kzv jf+1qd 4ugqnlg(,y *kfraction of 1.50. What is its critical angle of inciden+zlg*u 1njgvkq 4k y*+d(f b,qce?

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 witw /z0;oma /jsedyks)* h index of refraction of 1.50. For whaym/d;os*/w0aes k )jzt 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 substanzhduh+p-7c2,q rhj nsw;. o13bp0em xce 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 substa3u m)e-0eh6dgct sp4 knce from 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 mm. Its ends are pe (ow33m5 gb/hz;krpc zrpendicular to its axis. Its index of refraction is 1.30. What is the maximu35/3b;cwzz km rp go(hm 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 a 20 cm focal lengthc*vgubb b /4+v converging lens. How far is the image of this object fu* b 4gv+bv/bcrom 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 4aqa(uw9w ;z: md*pwlr41 ) lemn f+pgconverging lens with focal length 4 cm. Where is tqw*m 1 +4m):wl fraw49g ;l dan(zuppehe image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converging lens, and the image is 4.0 1wf p97kslh ( bxgn+p/mm behind the lens. What is the focal length of the pf / 1px nhk9sb(7lwg+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 convergif 1-19x j(omcg.ax f (tbgz /0w(fl+t.its bztng lens. If the image is 4.0 mm tall, how far is it from the lens(.+1 .1wst9jio ( 0f t gxz/-fxztlgcamf(btb?

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 od*zn0mou 1uc/f a converging lens the inverted image is half the size of the1 *md/0cznu uo object. What is the focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal length 5.q+h g/ h.p5 egs4lx)xr0 mm. Where is the object? p+ghsg4 ex lr/hxq.5)

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 mwjm6o hlnpwh,sr4iag7 (29( converging lens. The image is virtual and 6.2 cm tall. What is the f,6 alsm ngijr(9 7hwom4(p2 whocal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lens. The image is 4.0 mm tall, and iqo je5p.unvxn)pya9*v(c8)9cf-bb 9.0 cm from the lens. How tall is the objep)ubyc9 9)jevi8aq (-nxfpc.b*vo5n ct?

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 lens, it forms a rea)1 ykr 8ynt 6s,;occv0x)c oeyl image. When the object is moved to 40 cm from the l)e yyvcr co1 k0,;)cts6yxno8 ens, the image moves 10 cm farther from the lens. What is the focal length of the lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 48p(t;cs34yot y ohly)8h ym gcm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance h o8yt4hsy8;lt op (gy3c)m4 yand 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 kff8(x /,4x j eqyf1+zapq v2ka focal length of 10k vx xf ,e1y4/(q+pz qf2kjaf8 cm. What is the image distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a die c+o75+ z7/ zt*dxmd+ehsd kfverging lens with a focal length of 10 cm. What is the magnificatk5d+ fc7 sd ztdee 7*m+o+/xzhion?

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 tyi ka, h69q5mzall, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from th6ikhqz5a ,ym9e 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, anm0mynunwz. ,vi6osbn 3i,;1zd is in front of a diverging lens. The image is 2.5 cm tall, and 7.ob1ynn wimzn ,6s 3v,;0uzmi .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 leu1f0ofzhj 8m8ixobj p9la f ;7)yo)a 6ns. If a virtual image forms at a distance of 50 cm from the lens, on the same side a mfio)89 1h l8j6;ojb 0ffoazx7)upy 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 mm8b+bji;7 hj 9r/kahcmh:ca)x must the object be placed if it is to form a virtual i/a:hxcjijabh; 9+ c )7h8br mkmage magnified 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, spoi, dlqnhq8t+ei oxt 5d5( p4d0ky2+uch as is used in many 35-mm cameras, must an object 2tt4 +yqd n8ip d0i 5xekldhp+o 5qo,(be positioned if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are placed in co akghi((x.z, vjtwazx: k .ro2vk15+l vdu 3x4ntact. What is the focal len5 :1(v.k( jh iutkx3 zdol2x v.a,g v4+azrxkwgth of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46 cm, and is mtql5nlut8am r.:+pu *ade of glass of index of refraction n =*5l mta.lnr8u+qp :tu 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 ;1lr dxa-whq lt7218*y*b1c w/uf jsml.znpk of 40 cm on the front side and 30 cm on the back side. What is the foc1/*8;w 2 xhydzmb1ktla rf71lq -wn p j*slu.cal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). Tae qtqo/go2:x 0.l 7zqhe radius of the front surface is 20 cm and tqg:lq2oex 7tzqa/.0 ohe 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 mjnrz6wx/ug -+f b7wy,qz- b/yade of glass of index of reyzy/-6nxb gur+ /b7jzwq, f- wfraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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