Question 1

Stephanie dips a glass rod into vegetable oil. The submerged part of the rod can't be seen because

Accepted Answer

A) refraction is unbent before light gets to your eye. 
B) both the oil and glass have the same index of refraction. 
C) of internal reflection. 
D) light has different speeds in the oil and glass. 
A) refraction is unbent before light gets to your eye. 
B) both the oil and glass have the same index of refraction. 
C) of internal reflection. 
D) light has different speeds in the oil and glass. B

Question 2

When light reflects from a surface, there is a change in its

Accepted Answer

A) frequency. 
B) wavelength. 
C) speed. 
D) all of the above 
E) none of the above 
A) frequency. 
B) wavelength. 
C) speed. 
D) all of the above 
E) none of the above E

Question 3

The image in a pinhole camera is

Accepted Answer

A) always inverted. 
B) sometimes inverted. 
C) always right-side up. 
A) always inverted. 
B) sometimes inverted. 
C) always right-side up. A

Question 4

Light of different colors in a vacuum travel at

Accepted Answer

A) different speeds. 
B) the same speed. 
C) the same speed in both a vacuum and all materials. 
A) different speeds. 
B) the same speed. 
C) the same speed in both a vacuum and all materials.

Question 5

Sunlight passing through a pinhole in a piece of card casts a solar image on the ground. If the card is held so the image exactly covers a coin, measurements will show you could fit 110 coins between the image and the card. This further tells you

Accepted Answer

A) 110 Suns would fit between the top of the card and the Sun. 
B) that this activity is useful for estimating the Sun's diameter. 
C) both of these 
D) neither of these 
A) 110 Suns would fit between the top of the card and the Sun. 
B) that this activity is useful for estimating the Sun's diameter. 
C) both of these 
D) neither of these

Question 6

If the speed of light in a sphere is 2 × 108 m/s, its 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 7

Reflected light from the Moon in a lake often appears as a vertical column when the water is

Accepted Answer

A) perfectly still. 
B) slightly rough. 
C) very rough as with churning waves. 
A) perfectly still. 
B) slightly rough. 
C) very rough as with churning waves.

Question 8

A rough surface for infrared waves may be polished for

Accepted Answer

A) radio waves. 
B) light waves. 
C) both of these 
D) neither of these 
A) radio waves. 
B) light waves. 
C) both of these 
D) neither of these

Question 9

When a colored light in air shines on water and is refracted, its wavelength

Accepted Answer

A) shortens. 
B) remains unchanged. 
C) lengthens. 
A) shortens. 
B) remains unchanged. 
C) lengthens.

Question 10

Fermat's principle could be the principle of least distance for

Accepted Answer

A) reflection. 
B) refraction. 
C) both of these 
D) neither of these 
A) reflection. 
B) refraction. 
C) both of these 
D) neither of these

Question 11

If a fish in a pond looks upward at 50° to the normal, it will see

Accepted Answer

A) the pond's bottom. 
B) the sky and possibly some tall surroundings. 
C) only the water's surface. 
D) none of the above 
A) the pond's bottom. 
B) the sky and possibly some tall surroundings. 
C) only the water's surface. 
D) none of the above

Question 12

Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of

Accepted Answer

A) the Sun. 
B) the openings themselves. 
C) both of these 
D) neither of these 
A) the Sun. 
B) the openings themselves. 
C) both of these 
D) neither of these

Question 13

The critical angle is least in

Accepted Answer

A) glass. 
B) water. 
C) diamond. 
D) vacuum. 
A) glass. 
B) water. 
C) diamond. 
D) vacuum.

Question 14

Optical fibers are commonly used by

Accepted Answer

A) surgeons. 
B) mechanics. 
C) engineers. 
D) aviators. 
E) all of the above 
A) surgeons. 
B) mechanics. 
C) engineers. 
D) aviators. 
E) all of the above

Question 15

Refraction causes the bottom of a swimming pool to appear

Accepted Answer

A) farther down than it actually is. 
B) closer to the surface than it actually is. 
C) neither of these 
A) farther down than it actually is. 
B) closer to the surface than it actually is. 
C) neither of these

Question 16

Light travels fastest in

Accepted Answer

A) warm air. 
B) cool air. 
C) a vacuum. 
A) warm air. 
B) cool air. 
C) a vacuum.

Question 17

Fermat's principle applies to

Accepted Answer

A) reflection. 
B) refraction. 
C) both of these 
D) neither of these 
A) reflection. 
B) refraction. 
C) both of these 
D) neither of these

Question 18

If you view a rainbow out your window while riding in a train, you'll see that

Accepted Answer

A) the rainbow can only be seen while you're moving slowly or at rest. 
B) the rainbow moves along with you. 
C) you soon pass by it, leaving it where you first saw it. 
A) the rainbow can only be seen while you're moving slowly or at rest. 
B) the rainbow moves along with you. 
C) you soon pass by it, leaving it where you first saw it.

Question 19

When spearing a fish with a regular spear, to compensate for refraction, 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 20

The shortest plane mirror in which you can see your entire image is

Accepted Answer

A) half your height. 
B) about 3/4 your height. 
C) about 1/3 your height. 
D) equal to your height. 
E) dependent on your distance from the mirror. 
A) half your height. 
B) about 3/4 your height. 
C) about 1/3 your height. 
D) equal to your height. 
E) dependent on your distance from the mirror.

Exam 28: Reflection and Refraction

Stephanie dips a glass rod into vegetable oil. The submerged part of the rod can't be seen because

When light reflects from a surface, there is a change in its

The image in a pinhole camera is

Light of different colors in a vacuum travel at

Sunlight passing through a pinhole in a piece of card casts a solar image on the ground. If the card is held so the image exactly covers a coin, measurements will show you could fit 110 coins between the image and the card. This further tells you

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

Reflected light from the Moon in a lake often appears as a vertical column when the water is

A rough surface for infrared waves may be polished for

When a colored light in air shines on water and is refracted, its wavelength

Fermat's principle could be the principle of least distance for

If a fish in a pond looks upward at 50° to the normal, it will see

Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of

The critical angle is least in

Optical fibers are commonly used by

Refraction causes the bottom of a swimming pool to appear

Light travels fastest in

Fermat's principle applies to

If you view a rainbow out your window while riding in a train, you'll see that

When spearing a fish with a regular spear, to compensate for refraction, throw your spear

The shortest plane mirror in which you can see your entire image is

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