Question 1

Atmospheric refraction makes the daylight hours a bit

Accepted Answer

A) longer. 
B) shorter. 
C) longer in summer but shorter in winter. 
A) longer. 
B) shorter. 
C) longer in summer but shorter in winter.

Question 2

At night an underwater scuba diver aims a flashlight beam toward the surface at 15° to the normal. Upon emerging into the air, the beam angle will be

Accepted Answer

A) less than 15°. 
B) 15°. 
C) more than 15°. 
D) impossible to predict. 
A) less than 15°. 
B) 15°. 
C) more than 15°. 
D) impossible to predict.

Question 3

When you are beneath the surface of water and looking upward, light from above is seen

Accepted Answer

A) within a cone of 96°. 
B) at angles beyond a cone of 96°. 
C) at any angle if the surface is smooth. 
A) within a cone of 96°. 
B) at angles beyond a cone of 96°. 
C) at any angle if the surface is smooth.

Question 4

A "burning glass" used to concentrate sunlight in a tiny spot is a

Accepted Answer

A) converging lens. 
B) diverging lens. 
C) either of these 
D) neither of these 
A) converging lens. 
B) diverging lens. 
C) either of these 
D) neither of these

Question 5

The type of lens that brings parallel light rays together is a

Accepted Answer

A) converging lens. 
B) diverging lens. 
C) combination of converging-diverging lens. 
A) converging lens. 
B) diverging lens. 
C) combination of converging-diverging lens.

Question 6

Stars twinkle when seen from Earth. When seen by an astronaut on the Moon, stars

Accepted Answer

A) twinkle more. 
B) twinkle less. 
C) don't twinkle. 
A) twinkle more. 
B) twinkle less. 
C) don't twinkle.

Question 7

The Moon's redness during a lunar eclipse is due to

Accepted Answer

A) light of lower frequencies reflected from the Moon. 
B) excess infrared radiation. 
C) an optical illusion. 
D) refracted light from Earth's sunrises and sunsets. 
E) none of the above 
A) light of lower frequencies reflected from the Moon. 
B) excess infrared radiation. 
C) an optical illusion. 
D) refracted light from Earth's sunrises and sunsets. 
E) none of the above

Question 8

A pinhole cameras has no lens. The tiny pinhole opening insures that rays of light from different parts of an object

Accepted Answer

A) overlap. 
B) don't overlap. 
C) bend to a focus. 
A) overlap. 
B) don't overlap. 
C) bend to a focus.

Question 9

The amount of light reflected from the front surface of a common windowpane is about

Accepted Answer

A) 4%. 
B) 8%. 
C) 40%. 
D) 92%. 
E) 96%. 
A) 4%. 
B) 8%. 
C) 40%. 
D) 92%. 
E) 96%.

Question 10

A person who sees more clearly under water without eyeglasses or a facemask is

Accepted Answer

A) nearsighted. 
B) farsighted. 
C) neither of these 
A) nearsighted. 
B) farsighted. 
C) neither of these

Question 11

When a mirror with a fixed beam on it is rotated through a certain angle, the reflected beam is rotated through an angle that is

Accepted Answer

A) equal to the angle of rotation. 
B) twice as large. 
C) four times as large. 
D) none of these 
A) equal to the angle of rotation. 
B) twice as large. 
C) four times as large. 
D) none of these

Question 12

When a pulse of white light is incident on a glass prism, the first color to emerge is

Accepted Answer

A) red. 
B) orange. 
C) green. 
D) violet. 
A) red. 
B) orange. 
C) green. 
D) violet.

Question 13

As monochromatic light passes from air to glass and back to air, changes occur in its

Accepted Answer

A) wavelength. 
B) speed. 
C) both of these 
D) neither of these 
A) wavelength. 
B) speed. 
C) both of these 
D) neither of these

Question 14

The image of the "infinitely-far-away" Sun produced by a converging lens appears

Accepted Answer

A) between the lens and the focal point. 
B) at the focal point. 
C) beyond the focal point. 
A) between the lens and the focal point. 
B) at the focal point. 
C) beyond the focal point.

Question 15

Ninety-five percent of light incident on a mirror is reflected. How much light is reflected when three of these mirrors are arranged so light reflects from one after the other?

Accepted Answer

A) 81% 
B) 85% 
C) 86% 
D) 90% 
E) 95% 
A) 81% 
B) 85% 
C) 86% 
D) 90% 
E) 95%

Question 16

In optical fibers of uniform density, light actually

Accepted Answer

A) curves in a direction parallel to the central axis of the fiber. 
B) travels in straight-line segments. 
C) travels along the outer surface of the fiber. 
D) none of the above 
A) curves in a direction parallel to the central axis of the fiber. 
B) travels in straight-line segments. 
C) travels along the outer surface of the fiber. 
D) none of the above

Question 17

A diver shines light upward to the surface of a smooth pond at 20° to the normal. Most light passes into the air above while the part that reflects back into the water makes an angle to the normal of

Accepted Answer

A) less than 20°. 
B) 20°. 
C) more than 20°. 
D) all refracts, none reflects. 
A) less than 20°. 
B) 20°. 
C) more than 20°. 
D) all refracts, none reflects.

Question 18

When the tiny hole in a pinhole camera is made larger, the image is

Accepted Answer

A) brighter but less clear. 
B) clearer. 
C) right-side up. 
D) none of the above 
A) brighter but less clear. 
B) clearer. 
C) right-side up. 
D) none of the above

Question 19

The critical angle for a transparent material is the angle at and beyond which all light within the material at its upper surface is

Accepted Answer

A) refracted. 
B) reflected. 
C) absorbed. 
D) dispersed. 
E) diffused. 
A) refracted. 
B) reflected. 
C) absorbed. 
D) dispersed. 
E) diffused.

Question 20

Light travels from one place to another along a path of least

Accepted Answer

A) distance. 
B) time. 
C) effort. 
D) expense. 
E) complication. 
A) distance. 
B) time. 
C) effort. 
D) expense. 
E) complication.

Exam 28: Reflection and Refraction

Atmospheric refraction makes the daylight hours a bit

At night an underwater scuba diver aims a flashlight beam toward the surface at 15° to the normal. Upon emerging into the air, the beam angle will be

When you are beneath the surface of water and looking upward, light from above is seen

A "burning glass" used to concentrate sunlight in a tiny spot is a

The type of lens that brings parallel light rays together is a

Stars twinkle when seen from Earth. When seen by an astronaut on the Moon, stars

The Moon's redness during a lunar eclipse is due to

A pinhole cameras has no lens. The tiny pinhole opening insures that rays of light from different parts of an object

The amount of light reflected from the front surface of a common windowpane is about

A person who sees more clearly under water without eyeglasses or a facemask is

When a mirror with a fixed beam on it is rotated through a certain angle, the reflected beam is rotated through an angle that is

When a pulse of white light is incident on a glass prism, the first color to emerge is

As monochromatic light passes from air to glass and back to air, changes occur in its

The image of the "infinitely-far-away" Sun produced by a converging lens appears

Ninety-five percent of light incident on a mirror is reflected. How much light is reflected when three of these mirrors are arranged so light reflects from one after the other?

In optical fibers of uniform density, light actually

A diver shines light upward to the surface of a smooth pond at 20° to the normal. Most light passes into the air above while the part that reflects back into the water makes an angle to the normal of

When the tiny hole in a pinhole camera is made larger, the image is

The critical angle for a transparent material is the angle at and beyond which all light within the material at its upper surface is

Light travels from one place to another along a path of least

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