Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images fckx7cye+ e8 bq;9z9 rby mirrors and lenses has been successful described ce+x b8y;c9qk erfz97 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 incidenczn.6t ip0q4w)sv-07b zjf sr ce

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirs:oslxz 6.r1je4*k ukrors 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 thu8pxh/a v2hzbbc0*nft cn2 +r: i7*6rnsl 9myat 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 w+sn x;fv7x.;oca tuy: gp- s-+j4n, 9irhrdix hich

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 through the ima 6,9sjj4 t,pbnozrma1ge location, and would not appear on paper or film placed at that location snzpm6ot,4b 1rj a9 j,is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through the image location, abq4d.;tbcv0 cdh.3i lk4 7 ubpnd could appear on paper or 4ic0 qd7 khdbc.l uv.;43bpbt film placed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a virtual im,ns xxjo 9j.o(age?

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 placej s z;p)tv88fls+qin1 on the outer surface of the spherical shape is referrj ;)1t8 vl8sipfzq+sn ed to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner st0.scn z6bbs z8.pg 4vurface of the sphere is referred tsc z vtnbg b4p.68.0zso 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 o1 kb01 heov47nn)a x2zpre+ 6wh;oyjmirror 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'bco.m3wap67eb)bq w* u my8d 6s axis, strikes the mirror's surface near its midpoint. After rm6 bcy oud673weamb*.)qp 8wbeflection, 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 parall-b8b vxt 6z/uy+vb sw3el 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,ap9 5ltp nl3iq h4cs;tc 16ft- crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, this r q;56 ttcln alitp4c s3-fp9h1ay

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 t *6:rl3hs m;lf vmzi3nhrough the center of curvature is l3si6zhl:r mn*mvf;3reflected

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, travelingtmp*w;)n 6vww m jcjij.(6/ tc obliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After rew mc c)j*6p/ .twvjm(it;wj6nflection, 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 focal point i hy. rom)da*c,n(k fyu(/c,cus reflectecc,fcahnuy, k o(/(m)rd .yu* d

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 thuvk.*8 yjg0h we image position due to a curved mirror.y0g. 8 jw*hkuv

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 aii-gvw(9 4ua)vf j (hv 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 curvature. The ima9.on2v1hz -tf m1j4nm ov- fdbaw*9z vge produced --ozb1dfm4f.9h1*am2ov vwtz 9nn vj by 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's centnod+t9oos8+edyud*cd5 iq(s ie.6o / er of curvature and its focal point. The imo*68s/5qs+.ddi nodecod9+ io e(yut age 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 betwe6lds gs g-c6(uen a concave mirror's surface and its focal point. The image ucg6sl6( s gd-formed in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror,q tev)fpibl -y/i/5:,z ak zc0 at the same distance from it as its radius of czi/a/kp- vlbc:ei0 5t yzq,f )urvature,

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

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

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

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance f.qew 2owmnf*9rom it as its focal len9. m2few n*oqwgth,

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 magnifibxw4(-,/kka ecn.fgked image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a x,ab(kgc.-/k wnke 4 fshiny 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 mirrov/2 v5z:aymamjua );urs 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 images which 5x zoai9bopl5/.x/l9x mzg( b

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 r:x,9k7k 3 lt tbngp(7tjrh.jmirror produces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an image whiu- uv1: -hj1enl exs9rch 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 by,j7ha ld 0 d*ici48nmirror 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 illbqr7,vcd 1 fg q5+u(mage 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 jgo*1q)w )b9ew j4vkv 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 u t9e40c8 bgoty 0ee5ois 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 valu(+x no3 hn,umfe, 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 om4meo 4fugpy0* wsn,to ((*a larger than one, then the image is( n0wt4 y ps,oo4goma fe*m(*u

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 than one, then the image *pv2)ro,fxf czlnq:2 isf2ocz)qp2*, xfln:rv

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 t3 +37hjdq,uyght7u/7kv vs+nosw(h dhe 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 fastest+( s,dyivzduhk 0qvei7e9 n( /)rzgr-

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances,cp y7m+4fd(hi 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 refractiop5b 2ikmz6xx 0ls-:n zye.:j un less than one 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 of diaml r gcg+2+vhpyv h3s;r2y o)y+ond 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 inciden4 xj/xs6mm p6hce

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 a 1 9,:ctq kalwet:fxv5j+ 7prrefracted

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. Thjw4l1d3psu on2 ur2 k:e 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 trony7*j.g+er6hh0 b v(aq,vvv g fv12taveling 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 whiu8ac taoqhcli4+ 4-2)2-u y z s1ztupuch fiber 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 passing from water into air ihv2e8/ dsp02w 0ljpvps $48.8^{\circ}$. 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 levoe 1ikp9412 kjit 8yhnses 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 c5-oy;jae zydhh ndf u)8n4o ,;bvb9 ,zenter 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:5ixm* y ms3o7sjqfs f4nd2/ g center 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 the centi vn):sxka5q48 s*m1an )2ud7q culwner

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 9fbpy.-yb l9ti*lwspt q* 3xc2(w;eg at 20 diopters, wher*lf .-lw23bci pygx9;et9p(* wyb qtseas lens A is rated at 10 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 thin conca u9jzxpfdt6 **ve lens, strikes the lens near its midpoint. After traveling though the lens, thisujf9z* xdt6*p 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 crjmlgp -c4)++te o ()x1upbfv onvex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis t l-recvuf1m+p4joxg+)( )bp 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 -+iuq;w, qb:6xqoii4xsu. bt for finding the image position due to a thin leni 4-xs bq6w iqxibt,.+ouuq;:s.

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 lb5 4iqw5e0ely:bme ow cq 9w3 f:ah3d,ength $f$. 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 -xd 4 m az)wawb1bfvl4 6--5ahjw-pz wlength $f$. 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 fo+: pgangq)i*dt fs)(am zv1 0/nony 4ycal 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 focal2r +-ssp.vm 2 -:+vgcb cecfygag3 r)w length $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal length tot+3qt3ja es-/8nwcr:q n)y$f$. 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 betweq*9e, 5lm3ebpjlpd4)y(i*vrq y w kp*en a convex lens and its focal point. The image formed is*ijqyb, w*kvpypel 3 rq*( 4d l5p9)em

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 concm 8q,f(k,vr nbave 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 ytsi;+ evu,g0w ou 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. Betw;yj(ocz78fm d een the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be i8 o7jczymf;d( maged on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focal lengthsp6am*y j; s:/ucgwak* $f_1$ 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) a( h8guqh(9g l)k :gc1d,xlidf-he a1lenses are placed in contact. If each has a focal length of 20 cmglld g-h:1(dik19u )fq,ahagxehc 8( , how would you expect the combination to function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. converge.

B. diverge.

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

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

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes 3ey1bpq g-)-itj+gw e a plane's reflecting surface with an angle of incidence of +-gwpeygebi3 qt -)j 1$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of a plane mirror. Th o36z krvn;h9 zase(v(e image formed by the mirror appears znzkh v a s3(9v(6oer;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 yeuq/8eb6 0 n1to feeen-btevt9:: h3 uour image when you stand 0.75 m in front of a vertical pla: vteo8fee3bh nq 0u-t/e16be :nt ue9ne 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 approach a vertical plane c 6rxx7o8un ffr 82loa55* ooymirror at a speed of ral 5oo5uy x88cnf2 o7xr6*f o2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of curvature of 20 cm. H 4 9v3r fpl.jnzedjc2j*hu6c+ ow far from the mirror is the focal point locer p4cdv jj2c n6 93z*ju.flh+ated?

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 3 mb(wjc3b e;sp -z6swcreates a real image 30 cm from the mirror. What is bwz3p-6swmj 3 sec;(bthe 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 mi(tg9vkx0p4 ai)jbq bi6b n.px a*3j5grror, and the image is 3.0 cm in front of the mirro.(nj v j9gk0 qipt b*x3aabgbp 4)6x5ir. 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 concave mirror with focal length 3 cm. 4:v utnqmn *d9 23rtouWhere is the imag nqd 2v9u*n:r4o 3mttue?

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 f4cm 2btq6h le4ocal length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's h qtc64 2elmb4axis. 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 20 cm. An ok+dd .t 6k0zrobject is placed 30 cm in front of the mirror on the mirror's kd+k06o. r tzdaxis. 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 concave mirror. Thfkg24 qeic-;*7ykaj b0cfd ;q e image is 4.7 cm tall, and 10 cm from the mirror. How tall is the of 7kc; ;qj d0iy- qcfkb4ae2*gbject?

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 4ipx vtj6o6qoye8j2 815 cm from a concave mirror of focal length 20 cm. The object is 4oo86vpi6q 8 4jjy ex2t.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 is 38.zz(ss/0qjwl1 g / s*qv6 cm tall, and 14.8 cm from the mirror. How f(vqgs 01/l*zsqws/j z ar is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object isz 2(zt6f/ pj c7tx 7t3vje2jne 4.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is/t3 xnz67t(jvpjzt ecje722 f 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 obedkj8v3 4 oah,ject a h83,v eo4djkis 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 mip ( 776nzpuuz9myj1rmrror), the erect image is twice the size of the object. What is the focal lenrmmpn97uz1( yuj6zp7 gth 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. If the imagdsc85 fl pmz:cg e.g16e is an erect image 1.5 times as large as the object, what is the mirror's focal .5zs8 pmfgc 6de:g c1llength?

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 cmo2op8i;d3 t a hbnd qe5:/ipf4. Where is the obje2of/di a 3o84pq b:;enthpid5ct?

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 -2 6x76jjnlfq i4 bkb8zl:c(jb;0 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is b64:c6jllbx;j nj8iz b7k(fqthe 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 mik0)*32eb:nsx1wbyiw7-/u hgck g zc q6e sc4rrror has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Wheregn/xgkcrc1biw2e3 7-ces:46 hb zy0ks)w *q u 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 fhb/ ) fh4sgh4xront of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirr)4bxs 4hh /fhgor?

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+ f.di5zmt vh.. The image is 7.80 cm tall, and 14.8 cm from a convex mirror. What iv5 di.h. mf+zts 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, what is the spc8do 1kaovct*d6 st:7 eed of light throug*8d7 stcdtaoc:vok 61 h 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 m9b,lkk: g+gj swexk tv2;l -4glass 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 substaw9)rox*t ez )jru78 ,m uw(gsmnce 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 wq x+lbhn* m5tho m53e8ater. 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 ev)7tur 3bg7b5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. What is the angle of refractioebr u tg7b3v)7n in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a still :/ca*g ndinj;-uzk u0wag.* v 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 seeuagkc: n *-.;v*/jdz ugian0w 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, stria * w1 bzg3u8.wm-cwmdkes a plate of transparent material at an angm d w.aw3zum*c1 -wb8gle 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 inci2 k +dgxvel t..n50oimdent on a slab of transparent material. The incident beam and t5eg kvmn2.o+.0 ldxti he refracted beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refractin : 01bksnmir3on of 1.46. Light is passing through it at r0ns3m: kn 1ib$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light traveling from crown glass (pbzfgepqm8x eja-yb5 r29. . 0n = 1.52) into water (n = 1ej a9bxbmzgpq8 . fe.pyr0- 52.33)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of 1.50. What is its critical angle o:oi ;wt/whoc )pv) -mdf incidencp/ )w-i;:)owchodvtm e?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic with 2ycs3kuvui ,:index of refraction of 1.50. For what angle of incidence will lighysv u2u,ick :3t 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 fzx7pf zw o;q.(or a substance 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 azp2tvh(3jodd- uo2f84tc0 ux :xv *jcir 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, zv+1lsukyt,o+ n87uev3hpy . Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maxiy hp+v s38u n+lvz1oye 7tu,,kmum 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 leng52vcvm6jz6 *-c)ia zw3, lhwbhg r9rk y76ymsth converging lens. How *- mrihhc,k63z6gzvl 25j6mvw) abcw9yy7rsfar is 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 a converging lens with focal kfo7iz2 ,vjdz*55l46ljwmy m length 4 cm. Where is the ima5wj2vilmy ,o6zd 7*zlkm 5fj4ge?

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 iq.) 6 0a ,aqyy7o*lrmdy moey5-csp1 amage is 4.0 mm behind the lens. What is the focal leamay-,d y 1yp*oq ca.0o7m )le5s 6yrqngth 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 converging lens. If the image is 4.0 mo 6sn ta-w,z6mm tall, how far is oz6w ta-m6sn, it from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a conv9d xf3qc;tdj( sn6 hk-+d-jp zerging lens the inverted image is half the size of the object. h z 6t+nxd-kcd3q ps;j(9df -j What is the focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal length 5.0 mm. Whe687uu/kpbgypt xx19 zre is the objec6kxg19y 7 z pbput/8uxt?

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 converging lensci dom3 pw)p i28yfx.+. The image is virtuaw.pxo8i2mif p y+ d3)cl and 6.2 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 mm from a converging leqcjil.c d:h+n.4u ; oqns. The image is 4.0 mm tall, and 9.0 cm from the lens. Hon.c +dlujqq;h :o4 c.iw 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 lens, it formskn*1i7; sys tcgr5 16g wzv+qs a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is thesg+1 vk6;zn17rs twsgyci q5* 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 conves; nht/o 1b1bmx lens. The lens has a focal lbh bns/;1ot 1mength 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 tc/u4vwc5lz8 a diverging lens with a focal length of 10 cm. What is the image dista8v 4utz5lw/ccnce?

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 -1 eeks+x t44n m6s5oyg y8potof a diverging lens with a focal length of 10 c no1es4+ t8o -6x4gk eysymt5pm. What 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 cm6 ko f :2(xvx/a 7rfbvtf)uj7v tall, and 4.8 cm in front of a diverging lens. The image is/oku xvj7fbfx 76rtv)a2(: vf 4.0 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 a diverging lens. The image ik uuje/g24d*hx mh;e6s 2.5 cm tall, 4heg62/m kx *jduheu;and 7.5 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 4 g(:lvfe(x/rs0 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on th( x slge:fr/(ve 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 oy9(:8e-jorn0f e c6f:s gc6uz:lvgu be placed if it is to form a virtual image magnified in es:nvugojzfu9:-6:8rl f(ccg6 oy0 e 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 lengf if7tjnk6 dt- mw:rkp8/o(/ sth lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real imager6tw-on8 7kftif /pkm j( :d/s 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 conta/o (-(zuz8tnsfq )10vsdv wte ct. What is the f8fss /n(-d)0 wovu(v 1 zzteqtocal length of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radiieo:-hu8fj q; yy/h p8s of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is the focal eh8/fyq:- sjpu8yo;h 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 lenswkfti+jt ( y 6ie)crfa :ub1.):j dh1u made of glass (n = 1.50) has a radius of 40 cm on the front sijidr aby) :i)1hu e1j: 6f+tufk w.tc(de and 30 cm on the back side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). The radius nzl j(wh;w :f2stn) 0sof the front surface is 20 cm and the radius of the back surfaw2) n0;f:sw(ln hs tjzce 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 +g(oyc/yr/i-ad ywiip- aq+0of 40 cm. It is made of glass of index of refracti/+i ra o (d-qi/-y0ayp c+iygwon
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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