Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors and lenszb ** r+qrd7: vnhlin:es has been successfu* ih7qdrv:b lr nn:+z*l 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 incidenq70 p wrnm(kosu)1 t,2bx 0sufce

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 workde41on8c- t e2.ydzim 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 ant5d9jo*.heve x9aa w 9(u ue6l 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 im gz5y5pm(j q/xages 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.edevi,any7h.t t44 a actually pass through the image location, and would not appear on p,ttv. y4.hd74eai e anaper or film placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through t -n d0.dhijfn*w4 ip-yhe image location, and could appear on paper or film placed at the that ij d hw*-n0yi np-d.f4location 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 2x 3pqgk2g)xn virtual 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 reflection takes place on the outer surface ogoj2f)e 4ptx.a m(( nrf the spherical.em2j gn(p4fa(ro xt) 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 which reflection takes plac )a ))sstzphti c/g**gzx r2;fe on the inner surface of the sphere isz/sfc2t )zhra*)gpig;x* ts) referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the concave ms4kqk*4 wq/;h9v qnrc mjhs+ )q7gcf8 irror 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 /eq;l y8nsz;pto a concave mirror's axis, strikes the mirror's surface near its midpoint. Afs;el pqyn/z8; ter 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 mirro6q 0ws)r0(nm oc6g xmmua.0u, av qoe f(a2b.rr 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 to a concave3g ibl :ii 6j0p6fuid8 mirror's axis, crosses the axis at the mi63uip gd 8ilijb:i 0f6rror's center of curvature 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 concav wp8p s;ia t)wk,n73sye mirror on a path through the center of curvature is kpsw)7a w3 pyn s8;,tireflected

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 oblm9e8a+3p2j(l-2 0si wcu unk+r kcj*s s-vn rsiquely to a concave mirror's surface, crosses the axis at the mirror's focal point before stri 8 9ruip+3ksnje 2 c*vc-(wu as+-jn02smrklsking 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 c9 xw(v lk- j82xbpxrval67g6doncave mirror on a path through the focal point is reflecteg2d v(wxxak9vpbj8 l7x-6rl 6d

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 by16f a9dcp1xdf t57pdue to a curved mira dtf9y5p61pdxf b 71cror.

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 focal phv)u414j-lfjl/afxmm4 d7t c oint,

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. sb/b (rwdpay7 p k-* c4fb(0lbThe image produced by the mirror is locatfpl(bc/ (ksdb70r bbp-*y a4wed

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 cond nt p+qdi7u7-cave mirror's center of curvature and its focal point. The image produced by the mirror is lo7nidp-d+ uq 7tcated

A. out past the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave vvkr qiie-9 .fl tk /:v*3ej jmu6f//amirror's surface and its focal point. The image formed inve i.f-vkt/e /l 3:6fi*jm /q9u rjkva 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 o k; asm,.8u*gxh n*xdf;.hnwm f a convex mirror, at the same distance from it as its radius of curvaturem khxn*.s;w*mdu g n;8xa,fh.,

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

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

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

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance from it auan.:l *zx6 mfc(9f -q 6lqhaes its focal lengt- h 6az(69qe:l.xcn lam*fquf h,

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

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

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

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved w*qgtf- p8qviut0l;jif5 r:8mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will yoqp80f:tvtg * 5q8jrifui w;l-u 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 po6y bi +w(zc: dfu 6mk;(i5ihjroduce 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 whm m(0le, mnd k-oi(ms6ich

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 pr;i z0h0vtu xv8i;:dqi oduces 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 spherictgnd0l);jq i +)f sa:pal mirror produces an image which is

A. always virtual.

B. always real.

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

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

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnificata)-e0e az; bnm;*oqkx ion for 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, the image formed is84rf 0g,je g;6z 4mdi 7fvlwcl

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 negativa9xl(5e6ng x we, the image formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is ay qk x3ak7b9c* 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 n is7qa u/5o7rwz,i5 vxhbg1 s2egative 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 lae,txi+j:.f2mi5pt rsrger than one, then the image is p,2txfi5riem +jt:s.

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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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 m 9sb1ci- r(vyx3h2s /.m,40drkdj.vxsb sudsmaller than one, then the image is.mj1ck4v dr 3 2-sm.0y(bdxs9uivs,x rsd/ hb

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 magnifibbu(m d(cidbxjs4 r0wc/2w63 cation 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 fastestz :27ro3hsdoy

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 subsme;: dl 54qcjn5: zu iumx/z61o v+jzytances, 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 dnw:gl w4 a4ma.y8bcdzbtq j29 9,+nomedium 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 refractiz16jh pfq6i6fu l)8dpon of 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 incidenti;b 1pzu zp;5vtc7z41 k:qxxce

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 anglib:(ggr10q/w enb3bf e into a denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The +8ks ksijuahub5;*z/:g5ur b +s1bqs 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;pa 3-dkk/fu t 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 whicbe+pg/h i7b)i h 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 025fuqz/w iok 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 workw web7kw5pvrr -u fl /6p.2q1k 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 ce. 9 as wl.*7rvfbrif8c pxux49nter called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center tw6+kmn udy+q (han 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 cen 6jzlaf+zftl em dls7+8 qf6-5ter

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 6 nqz7sxtg99gptnx1 u g91 t;jthat lens B is rated at 20 diopters, whereas lens A is rated at 10 diop9xq7u g nng1zx61ttg ;t9s9pj ters. 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 concave lens, strikes-sjsmuw+gdmm 9gh)t3m:mm4 8) ttc u5 the lens near its midpoint. After traveling though the lens, this ray emergu)m :tw s-smu8g4mj+c 593hd tmmm)gtes 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 th vc*53x904kygmvlwdm e axis of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of 4glmm*y59 kxvc3 w0d vthe 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 image position due to gras(v,seuhw 0y2 co, xh(1x64u yh(aa thin le2uya6xy ssah vw1,c4grh(o0,(x h u(ens.

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 hniqm6amqilv9/64,(cw)tni4,ovf j1c cr q,length $f$. An object is located at infinity. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a fe cccmdvd4ni.(nk9 o1ig9 5x2jl/2gyocal 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 lengthwakb tqfx4 mv4i*/ s x(f96)zx $f$. 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 g9h+l z: po lj6r7am-tfocal 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 fj dtb+ tm1++zpocal length $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex lens and its focal point. The image formed34n ahnsg/ ,fjlw6(y s+pm,uh is6,n3 4 a(n/sghh +mjl,fys wup

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 concave lenls0pg v*qurxefg/6p,9d -r:fses

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 maglt*ty 0yfi m/s):bv u+9lk6/k:h vipfnifying 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 is placefox-* 7al;.xq-j ziv dtyt1n*d a converging lens of focal length 24 cm. The filayx* t;xnjvi 7t d--q l1*azo.fment of the lamp can be imaged 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 l )cj.i+8wr i u83h,akee,ee o(xea6tb.(ieckengths $f_1$ 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) l3rsh /mqto x h9(etz20/y2vl nenses are placed in contact. If each has a focal length of 20 cm, how would you expect vhr/mlose thz20 ty(32q9nx /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 reflectingyeqcwae p c c0x)191te7mx(a6 surface with an angle of incidence of c c1ca761yp)e90xemawte(xq$52^{\circ}$. 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. The i8w;l.09n0 sgey qddvs4x oo-y-m7zi tu dy5h,mage formed by the mirrdyd95 xv.leoyd,wyi -;sm tg 7q400uhso8n- z or appears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image w8t h+xof+bq vzwt 9d ;)u86ibwhen you stand 0.75 m in front of a vertical plane)qxu w6f+i; 8tb+wbtdz8ov9 h 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 verb*tt yayx p,j.8r)d-a6hp2z7dw zl 7mtical plane mirror at a spea, zy 82zttdwp *.ymrh 6dp7-a)7l bjxed 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 mirro lbw+q3m+was0r has a radius of curvature of 20 cm. How far from the +l3wbwqs + m0amirror is the focal point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20nf:;n-,6 w ksjnal6fp cm creates a real image 30 cm from the mirror. What is th ;6ak,l6 nfnsf pn-wj: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 migl*n;gs ;h* :b.rlmbmrror, and the image is 3.0 cm in front of the mirror. What is the f;bsn * ;mmhbr:g. lg*local 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 mv/a-v -ukdf8cm. Where is the imdf mkav-u8-/v age?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An objs /;+g f;vj5,t,ktlwp -t ulwyect is placed 10 cm in front of the mirro py 5+;gf/ttusw lkv,,w;-tl jr 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 20 cllq;f*r0ps4 vax(n6p m. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image loq l;lfap4vp* rs0(6nx cated?

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 mip3edbhfr1;7 ge +7smurror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall isbuf3r;d17gmh pees+7 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 mirrouq e m*t2-d1sjr of focal length 20 cm. The object is 4.0 cm tall. How tall is t2jm -u tqd1*eshe 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 tally)v z;gw v2o2q, and 14.8 cm from the mirror. How far is the object from the mirrv22 )go;yvqwzor?

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 98rmdcqim( ))ul g0ais 4.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the mj)8ma90(dl ci) q gumrirror?

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 miw6 oak m(n:8mzomd8pb2l1d,ih b g)qwyea, -.rror of focal length 20 cm. The object is 4.0 cm t1adz2d,oao: inm,)bwh 6mmkw l e8q.- bygp(8all. 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 cosmeticr8xph 17 mi :zg+rzlb2x-ayf- mirror (concave mirror), the erect image is twice the size of tphm -rax:g7xizrzy 82f -l1+bhe 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 fr6ic eh. +kz vwump4cj81o3xi-ont of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is 14e68kmou pv+3wi x jz-chci. 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 4t6s3w(xgbv plength 5.0 cm. Where is the ob x sgwtb(3pv46ject?

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 focb0;c w5ow dcv3al length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image locatw dv0owbcc5 ;3ed?

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 objec 2mbvd 3uykwwm(4jma./1obx7 t is placed 30 cm in front of the mirror on the mirror's axis. Where is the image locate32vx m1b (7auk./dbmjw oy4wmd?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the42 ) jz1+tcmov, e)srdolo5a n mirror. What is c j)slrd1oz t4 v,no+) ao25emthe focal length 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 iself o6,zv9l;/v ibo hdgkq*/712zii i 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mir7 iz;ilkf oi1db*9 ,6iveg2 q/ ozlhv/ror'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 1.50ruj (uq, x u(.7xw)24hlivnwr, what is the speed of light thro w2w.4 (r (vix7nux)rq ljuh,uugh 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 0 8kbpou2 igu ,bgd(*dw yqe3(glass interface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance f+3i sly*27n;crxoh dfrom 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 indfmapa30(o / (rve6sacoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and evenl4 mt 21nog3kvr yxu6v1pa)t.vg :1q riy 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 of1n:1.4xv) aotumv ypqkg3vr2 g6r1t i $45^{\circ}$ 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 po; ae/iai8q3acfh5c;mnd of water. At what angle must the diver shine a beam of light toward the surface in order for aa qc83f;eh mci;/a 5ia 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, trave4qo) qp1mda h5ling in air, strikes a plate of transparent material at an anmq5h41op )d qagle 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 traveli4z(g,azz .slj8ba+jing in air is incident on a slab of transparent material. The incident beam and the refra 4l, aj zzaszi+8.b(gjcted 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 refract9w:5yug pq +wyion of 1.46. Light is passing through it at w5py:ywugq +9$53.0^{\circ}$. 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 crh8z4rrfj f ruum, i x*e.a9j5)own glass (n = 1.52) into water (n = 1.3, 5ifj)u 4urre r8.xfjhm a*9z3)?

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 otcc2b(11 m (qzys ok1lf refraction of 1.50. What is its critical angle of incidence?z( 21sqmcoctyl 1(b1k

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 plas1;y z6ivqo9wh. (k.;nnaswar tic with index of refraction of 1.50. For what angle of incidence will light remain within the 9woav; 6.n n.hrzas qywk;i(1plastic "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 substango+/k*xux ap; jpof 4,ce 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 fbpbw /m 2dq7wi)+w3 4feynj 3from 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 na b;it(f.o h(ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray ente;aon(t fbi(h. ring 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 length converging a072 s)2etpg jcfpnylu0pdbc /j2l11 lens. How far is the image of this object from the len0cupc/1syatj22 p1n) l 7gdlp2j0ef bs?

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 converg: n+n cv2f/ 6xfk)b)gxvq1 njging lens with focal length 4 cm. Where i)nxx 6/cngg):2kv j+fbnf1 v qs the 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 c uno*j)9lw/ u 8ljnwt-onverging lens, and the image is 4.0 mm behind the lens. What is the focal length of theu j 8wo9j)ntn*wlu-/ l 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. ei4o 7f609 )t7zcww q.lah (wyly8 hucIf the image is 4.0 mm tall, how far is it fru0f4 ey(w8hzhwy)7iq aloc6tl 7w. c9om 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 ;xlh+j av ;u 1 ls00weg1wcto2the inverted image is half the size of the object. What is the focal l; lut 1j xaeov2w+cg;shw01 0length 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 focu) sp5(prhgzz1ig55k al length 5.0 mm. Where is tp5zui(5 sr15z )hpggkhe 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 talluu 0hbn) zt q5dz*3vp7, and 10.3 cm from a converging lens. The image is virtual and 6.2 cm tall. z)dpunz0u 5t3q7b * hv 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 lens. The i, 6t,qxzwnb, vsnd /)7, bzrkgmage is 4.0 mm tall, and 9.0 cm from the lens. ,,) n tknvsqzr/d7xbg6,b ,wzHow 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 fo u. r*1fuersc8.p 9jygrms 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 the foc.f1g98 uu spejr*cy r.al 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 fo2 0pigf0jk( q)md7iat a distance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respect2o(jfmp) dfq 0 ikig07ively, of the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with a focal length ofvhd liz3t28zg3 d3nr* 10 cm. What is the image dis d gv2r8 *zil33tzd3hntance?

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 diverging lens with kwh hg.r-uo e)x)46loa focal length of 10 cm. Whatohlg4rheo-u6 )x.w)k 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. yl cseiqa.d;/ i05: r7bkzdn, and 4.8 cm in front of a diverging lens. The image is 45slnb;iei0 / cky.:a qrd. zd7.0 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 frxypp nmyf 61+4ont of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the py nx m+6p4fy1lens. 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 o a(bf rg-)+kesgoy2 5at a distance of 40 cm from a thin lens. If a virtual image forms at a dis o g)egfr+a2oys- 5kb(tance of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must the object be placed if isuw d1wyzg0( f6ai82 f ha)yc-t is to form a virtua 6wahfy( zusi1ywdf8)-20gc al image 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 lengtt2l83l ,kl aa2ly a+ccvq d1(lh lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a f2llccay +llqdtk (8a3a21 l, vactor 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, v.3dcqi( hlsh 9ic3yj(9yadrgn w1( cm, are placed in contact. What is the focal length of this compound l9vg(.l9ayc(1 h wjnc3d3(ydh iqsri, ens?

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-.9g0vg vb;./hicb:psh gqru is made of glass of index of refraction n = 1.6 .ru:bhqspb v.-cg0i/ hg v9;g0. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) has a radius of 40 cm u *mm.f;bagto7* w5 s/ysc py-on the front side and 30 cm on the bapa/m*b fw75s;ysgtm.c*yo- u ck 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 radius3ff3nsg x4ped /-ero3 of the front surface is 20 cm and the radius of the back surface is 30 cm. What is 43xo -d pefgef /s33nrthe 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 fvu778u 1e7vwcx w6 z r1swm3sjoq00k*vgf(plength of 40 cm. It is made of glass of index of refracqs1f (*0ug x wwv0r1jzp3ucm8 v7sf o67ke 7vwtion
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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