Question 1

Light is emitted when

Accepted Answer

A) electron clouds of atoms are forced into oscillation. 
B) atomic nuclei are made to vibrate. 
C) electromagnetic waves emanate from matter. 
D) high-frequency sound waves strike matter. 
A) electron clouds of atoms are forced into oscillation. 
B) atomic nuclei are made to vibrate. 
C) electromagnetic waves emanate from matter. 
D) high-frequency sound waves strike matter.

Question 2

Light will almost always travel 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.

Question 3

Different colors of light travel at different speeds in a transparent medium.In a vacuum,different colors of light travel at

Accepted Answer

A) different speeds. 
B) the same speed. 
C) light travels at the same speed everywhere. 
A) different speeds. 
B) the same speed. 
C) light travels at the same speed everywhere.

Question 4

If the speed of light in a medium is 2 × 108 m/s,the medium's index of refraction is

Accepted Answer

A) 0)50. 
B) 0)67. 
C) 1)0. 
D) 1)5. 
E) 2)0. 
A) 0)50. 
B) 0)67. 
C) 1)0. 
D) 1)5. 
E) 2)0.

Question 5

Rainbows are not usually seen as complete circles because

Accepted Answer

A) the ground is usually in the way. 
B) they are actually elliptical. 
C) they have no bottom part. 
D) raindrops are not perfectly round. 
E) rainbows are actually arched shaped. 
A) the ground is usually in the way. 
B) they are actually elliptical. 
C) they have no bottom part. 
D) raindrops are not perfectly round. 
E) rainbows are actually arched shaped.

Question 6

The twinkling of the stars is a result of atmospheric

Accepted Answer

A) reflection. 
B) refraction. 
C) scattering. 
D) dispersion. 
E) aberrations. 
A) reflection. 
B) refraction. 
C) scattering. 
D) dispersion. 
E) aberrations.

Question 7

Objects infinitely far away are focused by a converging lens

Accepted Answer

A) in front of the focal point. 
B) at the focal point. 
C) beyond the focal point. 
A) in front of the focal point. 
B) at the focal point. 
C) beyond the focal point.

Question 8

If you wish to hit a red fish with a red laser beam,you should compensate for refraction between the air and water by aiming your laser

Accepted Answer

A) directly at the sighted fish. 
B) above the sighted fish. 
C) below the sighted fish. 
A) directly at the sighted fish. 
B) above the sighted fish. 
C) below the sighted fish.

Question 9

A single raindrop illuminated by sunshine disperses

Accepted Answer

A) a single color. 
B) either low-,middle-,or high-frequency colors in most cases. 
C) all the colors of the rainbow. 
A) a single color. 
B) either low-,middle-,or high-frequency colors in most cases. 
C) all the colors of the rainbow.

Question 10

If you wish to spear a fish with a regular spear,you should compensate for refraction between the air and water and throw your spear

Accepted Answer

A) directly at the sighted fish. 
B) above the sighted fish. 
C) below the sighted fish. 
A) directly at the sighted fish. 
B) above the sighted fish. 
C) below the sighted fish.

Question 11

The average speed of light is greatest in

Accepted Answer

A) red glass. 
B) orange glass. 
C) green glass. 
D) blue glass. 
E) is the same in all of these 
A) red glass. 
B) orange glass. 
C) green glass. 
D) blue glass. 
E) is the same in all of these

Question 12

The secondary rainbow is dimmer than the primary rainbow because

Accepted Answer

A) its colors are inverted. 
B) it is larger,and its energy is spread over more area. 
C) it is farther from the viewer. 
D) it simply has much less energy than the primary bow. 
E) of an extra reflection and refraction in the drops. 
A) its colors are inverted. 
B) it is larger,and its energy is spread over more area. 
C) it is farther from the viewer. 
D) it simply has much less energy than the primary bow. 
E) of an extra reflection and refraction in the drops.

Question 13

Magnification from a lens would be greater if light

Accepted Answer

A) propagated instantaneously. 
B) traveled faster in glass than it does. 
C) traveled slower in glass than it does. 
D) beams spread out more. 
E) none of these 
A) propagated instantaneously. 
B) traveled faster in glass than it does. 
C) traveled slower in glass than it does. 
D) beams spread out more. 
E) none of these

Question 14

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 choices are correct. 
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 choices are correct.

Question 15

Ninety percent of light incident on a certain piece of glass passes through it.How much light passes through two pieces of this glass?

Accepted Answer

A) 80% 
B) 81% 
C) 85% 
D) 89% 
E) 90% 
A) 80% 
B) 81% 
C) 85% 
D) 89% 
E) 90%

Question 16

Object and image for a plane mirror lie

Accepted Answer

A) along the same plane. 
B) equal distances from the mirror. 
C) at right angles to each other. 
D) all of these 
E) none of these 
A) along the same plane. 
B) equal distances from the mirror. 
C) at right angles to each other. 
D) all of these 
E) none of these

Question 17

Your vision is sharpest when your pupil is

Accepted Answer

A) dilated. 
B) constricted. 
C) same either way. 
A) dilated. 
B) constricted. 
C) same either way.

Question 18

As a light ray enters or exits a water-air interface at an angle of 15 degrees with the normal,it

Accepted Answer

A) always bends toward the normal. 
B) always bends away from the normal. 
C) sometimes bends towards the normal. 
D) does not bend. 
A) always bends toward the normal. 
B) always bends away from the normal. 
C) sometimes bends towards the normal. 
D) does not bend.

Question 19

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

Accepted Answer

A) red. 
B) orange. 
C) green. 
D) violet. 
E) They all emerge at the same time. 
A) red. 
B) orange. 
C) green. 
D) violet. 
E) They all emerge at the same time.

Question 20

A primary rainbow is brighter than a secondary rainbow because

Accepted Answer

A) sunlight reaching it is more intense. 
B) there is one less reflection inside the water drops. 
C) larger drops produce primary rainbows. 
D) the secondary bow is a dim reflection of the primary rainbow. 
E) none of these 
A) sunlight reaching it is more intense. 
B) there is one less reflection inside the water drops. 
C) larger drops produce primary rainbows. 
D) the secondary bow is a dim reflection of the primary rainbow. 
E) none of these

Exam 28: Reflection and Refraction

Light is emitted when

Light will almost always travel from one place to another along a path of least

Different colors of light travel at different speeds in a transparent medium.In a vacuum,different colors of light travel at

If the speed of light in a medium is 2 × 108 m/s,the medium's index of refraction is

Rainbows are not usually seen as complete circles because

The twinkling of the stars is a result of atmospheric

Objects infinitely far away are focused by a converging lens

If you wish to hit a red fish with a red laser beam,you should compensate for refraction between the air and water by aiming your laser

A single raindrop illuminated by sunshine disperses

If you wish to spear a fish with a regular spear,you should compensate for refraction between the air and water and throw your spear

The average speed of light is greatest in

The secondary rainbow is dimmer than the primary rainbow because

Magnification from a lens would be greater if light

In optical fibers of uniform density,light actually

Ninety percent of light incident on a certain piece of glass passes through it.How much light passes through two pieces of this glass?

Object and image for a plane mirror lie

Your vision is sharpest when your pupil is

As a light ray enters or exits a water-air interface at an angle of 15 degrees with the normal,it

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

A primary rainbow is brighter than a secondary rainbow because

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