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The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is The magnification of a lens is A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is A) 0.5 m. B) 0.505 m. C) 50.5 m. D) 500 m. E) 505 m. The magnification of a lens is The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is The magnification of a lens is A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is A) 0.5 m. B) 0.505 m. C) 50.5 m. D) 500 m. E) 505 m. A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is


A) 0.5 m.
B) 0.505 m.
C) 50.5 m.
D) 500 m.
E) 505 m.

F) None of the above
G) A) and B)

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A converging lens always forms an object's image at the focal point of the lens.

A) True
B) False

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A nanometer is


A) one thousandth of a meter.
B) one millionth of a meter.
C) one billionth of a meter.
D) one trillionth of a meter.
E) none of the above.

F) C) and D)
G) B) and D)

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__________ results because the speed of light in a transparent medium varies with frequency.

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Which angle is the angle of incidence for the light ray shown approaching the plane mirror? Which angle is the angle of incidence for the light ray shown approaching the plane mirror? A) 60° B) 30° C) neither D) either


A) 60°
B) 30°
C) neither
D) either

E) None of the above
F) A) and B)

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Of EM waves having these wavelengths, which would be visible?


A) 100 nm
B) 500 nm
C) 1000 nm
D) 1 nm
E) none of the above

F) A) and B)
G) C) and E)

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Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of polarization.

A) True
B) False

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You do not see your image when you look at a flat rough aluminum surface because of __________.

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The primary mirror in an astronomical telescope must be a


A) half-silvered mirror.
B) convex mirror.
C) concave mirror.
D) plane mirror.

E) A) and D)
F) B) and C)

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Your eye's iris changes the size of your pupil to adjust the amount of light that enters your eye.

A) True
B) False

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The advantage of a convex mirror is that it has a __________ field of view


A) narrow
B) linear
C) wide
D) open

E) C) and D)
F) B) and C)

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Optical fibers work because of


A) interference.
B) diffraction.
C) total internal reflection.
D) diffuse reflection.
E) polarization.

F) None of the above
G) B) and E)

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If the object distance (s) is less than the focal length (f) then the image is ____________.

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The orientation of an image seen projected on a screen by a single lens is always __________.

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Parallel light rays from a distant object strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at


A) the mirror's focal point.
B) a point beyond the mirror's focal point.
C) a point nearer than the mirror's focal point.
D) none of the above.

E) A) and B)
F) All of the above

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A diverging lens is thicker at the center than the edges.

A) True
B) False

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When light enters glass from air, which of these properties of the light change?


A) frequency
B) wavelength
C) speed
D) all of the above

E) B) and D)
F) None of the above

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What is meant by the term "plane mirror?"


A) not an unusual mirror
B) a flat mirror
C) a horizontal mirror
D) none of the above

E) A) and C)
F) B) and D)

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Halos are caused by hexagonal ice crystals in the upper atmosphere.

A) True
B) False

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In optics, what is meant by an "interface?"


A) optically connecting one computer to another
B) using the image created by one lens as the object for another lens
C) when the crest of one wave lines up with the trough of another wave
D) none of the above

E) C) and D)
F) A) and C)

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