Question 1

The image produced by a convex mirror of an erect object in front of the mirror is always:

Accepted Answer

A)  virtual, erect, and larger than the object 
B)  virtual, erect, and smaller than the object 
C)  real, erect, and larger than the object 
D)  real, erect, and smaller than the object 
E)  none of the above 
A)  virtual, erect, and larger than the object 
B)  virtual, erect, and smaller than the object 
C)  real, erect, and larger than the object 
D)  real, erect, and smaller than the object 
E)  none of the above

Question 2

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm. The distance from the mirror to the image of his nose is:

Accepted Answer

A)  8 cm 
B)  12 cm 
C)  16 cm 
D)  24 cm 
E)  32 cm 
A)  8 cm 
B)  12 cm 
C)  16 cm 
D)  24 cm 
E)  32 cm

Question 3

An erect object is 2f in front of a convex lens of focal length f. The image is:

Accepted Answer

A)  real, inverted, magnified 
B)  real, erect, same size 
C)  real, inverted, same size 
D)  virtual, inverted, reduced 
E)  real, inverted, reduced 
A)  real, inverted, magnified 
B)  real, erect, same size 
C)  real, inverted, same size 
D)  virtual, inverted, reduced 
E)  real, inverted, reduced

Question 4

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. Light incident parallel to the central axis is focused at a point:

Accepted Answer

A)  3 cm from the surface 
B)  6 cm from the surface 
C)  12 cm from the surface 
D)  18 cm from the surface 
E)  24 cm from the surface 
A)  3 cm from the surface 
B)  6 cm from the surface 
C)  12 cm from the surface 
D)  18 cm from the surface 
E)  24 cm from the surface

Question 5

A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, the least mirror area needed is:

Accepted Answer

A)  that of the whole mirror, regardless of its size 
B)  that of the pupil of his eye 
C)  one-half that of the card 
D)  one-fourth that of the card 
E)  an amount which decreases with his distance from the mirror 
A)  that of the whole mirror, regardless of its size 
B)  that of the pupil of his eye 
C)  one-half that of the card 
D)  one-fourth that of the card 
E)  an amount which decreases with his distance from the mirror

Question 6

The angle between a horizontal ruler and a vertical plane mirror is 30 $\degree$. The angle between the ruler and its image is:

Accepted Answer

A)  15 $\degree$ 
B)  30 $\degree$ 
C)  60 $\degree$ 
D)  90 $\degree$ 
E)  180 $\degree$ 
A)  15 $\degree$ 
B)  30 $\degree$ 
C)  60 $\degree$ 
D)  90 $\degree$ 
E)  180 $\degree$

Question 7

A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam:

Accepted Answer

A)  remains parallel 
B)  undergoes dispersion 
C)  becomes diverging 
D)  follows a parabolic path 
E)  becomes converging 
A)  remains parallel 
B)  undergoes dispersion 
C)  becomes diverging 
D)  follows a parabolic path 
E)  becomes converging

Question 8

As an object is moved from the center of curvature of a concave mirror toward its focal point its image:

Accepted Answer

A)  remains virtual and becomes larger 
B)  remains virtual and becomes smaller 
C)  remains real and becomes larger 
D)  remains real and becomes smaller 
E)  remains real and approaches the same size as the object 
A)  remains virtual and becomes larger 
B)  remains virtual and becomes smaller 
C)  remains real and becomes larger 
D)  remains real and becomes smaller 
E)  remains real and approaches the same size as the object

Question 9

A light bulb burns in front of the center of a 40-cm wide mirror that is hung vertically on a wall. A man walks in front of the mirror along a line that is parallel to the mirror and twice as far from it as the bulb. The greatest distance he can walk and still see the image of the bulb is:

Accepted Answer

A)  20 cm 
B)  40 cm 
C)  60 cm 
D)  80 cm 
E)  120 cm 
A)  20 cm 
B)  40 cm 
C)  60 cm 
D)  80 cm 
E)  120 cm

Question 10

A hollow lens is made of thin glass as shown. It can be filled with air, water (n = 1.3) or CS2 (n = 1.6). The lens will diverge a beam of parallel light if it is filled with:

Accepted Answer

A)  air and immersed in air 
B)  air and immersed in water 
C)  water and immersed in CS2 
D)  CS2 and immersed in water 
E)  CS2 and immersed in CS2 
A)  air and immersed in air 
B)  air and immersed in water 
C)  water and immersed in CS2 
D)  CS2 and immersed in water 
E)  CS2 and immersed in CS2

Question 11

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size?

Accepted Answer

A)  a focal length 
B)  half a focal length 
C)  twice a focal length 
D)  less than half focal length 
E)  more than twice a focal length 
A)  a focal length 
B)  half a focal length 
C)  twice a focal length 
D)  less than half focal length 
E)  more than twice a focal length

Question 12

Two thin lenses (focal lengths f1 and f2) are in contact. Their equivalent focal length is:

Accepted Answer

A)  f1 + f2 
B)  f1f2/(f1 + f2) 
C)  1/f1 + 1/f2 
D)  f1 - f2 
E)  f1(f1 - f2)/f2 
A)  f1 + f2 
B)  f1f2/(f1 + f2) 
C)  1/f1 + 1/f2 
D)  f1 - f2 
E)  f1(f1 - f2)/f2

Question 13

An ordinary magnifying glass in front of an erect object produces an image that is:

Accepted Answer

A)  real and erect 
B)  real and inverted 
C)  virtual and inverted 
D)  virtual and erect 
E)  none of these 
A)  real and erect 
B)  real and inverted 
C)  virtual and inverted 
D)  virtual and erect 
E)  none of these

Question 14

Which instrument uses a single converging lens with the object placed just inside the focal point?

Accepted Answer

A)  Camera 
B)  Compound microscope 
C)  Magnifying glass 
D)  Overhead projector 
E)  Telescope 
A)  Camera 
B)  Compound microscope 
C)  Magnifying glass 
D)  Overhead projector 
E)  Telescope

Question 15

An object is 20 cm to the left of a lens of focal length +10 cm. A second lens, of focal length +12.5 cm, is 30 cm to the right of the first lens. The distance between the original object and the final image is:

Accepted Answer

A)  28 cm 
B)  50 cm 
C)  100 cm 
D)  0 
E)  infinity 
A)  28 cm 
B)  50 cm 
C)  100 cm 
D)  0 
E)  infinity

Question 16

A point source is to be used with a concave mirror to produce a beam of parallel light. The source should be placed:

Accepted Answer

A)  as close to the mirror as possible 
B)  at the center of curvature 
C)  midway between the center of curvature and the focal point 
D)  midway between the center of curvature and the mirror 
E)  midway between the focal point and the mirror 
A)  as close to the mirror as possible 
B)  at the center of curvature 
C)  midway between the center of curvature and the focal point 
D)  midway between the center of curvature and the mirror 
E)  midway between the focal point and the mirror

Question 17

A convex spherical surface with radius r separates a medium with index of refraction 2 from air. As an object is moved toward the surface from far away along the central axis, its image:

Accepted Answer

A)  changes from virtual to real when it is r/2 from the surface 
B)  changes from virtual to real when it is r from the surface 
C)  changes from real to virtual when it is r/2 from the surface 
D)  changes from real to virtual when it is r from the surface 
E)  remains real 
A)  changes from virtual to real when it is r/2 from the surface 
B)  changes from virtual to real when it is r from the surface 
C)  changes from real to virtual when it is r/2 from the surface 
D)  changes from real to virtual when it is r from the surface 
E)  remains real

Question 18

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

Accepted Answer

A)  always 
B)  only if the index of refraction of the surrounding medium is less than n 
C)  only if the index of refraction of the surrounding medium is greater than n 
D)  never 
E)  none of the above 
A)  always 
B)  only if the index of refraction of the surrounding medium is less than n 
C)  only if the index of refraction of the surrounding medium is greater than n 
D)  never 
E)  none of the above

Question 19

A concave refracting surface is one with a center of curvature:

Accepted Answer

A)  to the left of the surface 
B)  to the right of the surface 
C)  on the side of the incident light 
D)  on the side of the refracted light 
E)  on the side with the higher index of refraction 
A)  to the left of the surface 
B)  to the right of the surface 
C)  on the side of the incident light 
D)  on the side of the refracted light 
E)  on the side with the higher index of refraction

Question 20

An erect object is located on the central axis of a spherical mirror. The magnification is -3. This means its image is:

Accepted Answer

A)  real, inverted, and on the same side of the mirror 
B)  virtual, erect, and on the opposite side of the mirror 
C)  real, erect, and on the same side of the mirror 
D)  real, inverted, and on the opposite side of the mirror 
E)  virtual, inverted, and on the opposite side of the mirror 
A)  real, inverted, and on the same side of the mirror 
B)  virtual, erect, and on the opposite side of the mirror 
C)  real, erect, and on the same side of the mirror 
D)  real, inverted, and on the opposite side of the mirror 
E)  virtual, inverted, and on the opposite side of the mirror

Exam 34: Images

The image produced by a convex mirror of an erect object in front of the mirror is always:

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm. The distance from the mirror to the image of his nose is:

An erect object is 2f in front of a convex lens of focal length f. The image is:

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. Light incident parallel to the central axis is focused at a point:

A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, the least mirror area needed is:

The angle between a horizontal ruler and a vertical plane mirror is 30 °\degree° . The angle between the ruler and its image is:

A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam:

As an object is moved from the center of curvature of a concave mirror toward its focal point its image:

A light bulb burns in front of the center of a 40-cm wide mirror that is hung vertically on a wall. A man walks in front of the mirror along a line that is parallel to the mirror and twice as far from it as the bulb. The greatest distance he can walk and still see the image of the bulb is:

A hollow lens is made of thin glass as shown. It can be filled with air, water (n = 1.3) or CS2 (n = 1.6). The lens will diverge a beam of parallel light if it is filled with:

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size?

Two thin lenses (focal lengths f1 and f2) are in contact. Their equivalent focal length is:

An ordinary magnifying glass in front of an erect object produces an image that is:

Which instrument uses a single converging lens with the object placed just inside the focal point?

An object is 20 cm to the left of a lens of focal length +10 cm. A second lens, of focal length +12.5 cm, is 30 cm to the right of the first lens. The distance between the original object and the final image is:

A point source is to be used with a concave mirror to produce a beam of parallel light. The source should be placed:

A convex spherical surface with radius r separates a medium with index of refraction 2 from air. As an object is moved toward the surface from far away along the central axis, its image:

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

A concave refracting surface is one with a center of curvature:

An erect object is located on the central axis of a spherical mirror. The magnification is -3. This means its image is:

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The angle between a horizontal ruler and a vertical plane mirror is 30 $\degree$ . The angle between the ruler and its image is:

A hollow lens is made of thin glass as shown. It can be filled with air, water (n = 1.3) or CS₂ (n = 1.6). The lens will diverge a beam of parallel light if it is filled with:

Two thin lenses (focal lengths f₁ and f₂) are in contact. Their equivalent focal length is: