Question 1

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 2

Use the following figure to answer the question:  
-From what you know about the refraction of various wavelengths of visible light,would red light and blue light from the same source produce images at the same place?

Accepted Answer

A) Yes. 
B) No.Blue light would make an image closer to the lens. 
C) No.Red light would make an image closer to the lens. 
A) Yes. 
B) No.Blue light would make an image closer to the lens. 
C) No.Red light would make an image closer to the lens.

Question 3

Fermat's principle of least time 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 4

When seen from an airplane,a rainbow sometimes forms a complete circle.When this happens,the plane's shadow is

Accepted Answer

A) in the center of the rainbow. 
B) in the lower part of the rainbow. 
C) in the upper part of the rainbow. 
D) totally outside the rainbow. 
E) nowhere,for there is no shadow. 
A) in the center of the rainbow. 
B) in the lower part of the rainbow. 
C) in the upper part of the rainbow. 
D) totally outside the rainbow. 
E) nowhere,for there is no shadow.

Question 5

Fermat's principle of least time could also be the principle of least distance for the case of

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 6

If you wish to hit a blue 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 7

You wish to photograph the image of your little sister,who is standing 2 meters from a plane mirror.Holding the camera beside her head,you should set the distance for

Accepted Answer

A) 1 meter. 
B) 2 meters. 
C) 3 meters. 
D) 4 meters. 
E) none of these 
A) 1 meter. 
B) 2 meters. 
C) 3 meters. 
D) 4 meters. 
E) none of these

Question 8

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 9

A beam of light travels fastest in

Accepted Answer

A) glass. 
B) water. 
C) plastic. 
D) air. 
E) is the same in each of these 
A) glass. 
B) water. 
C) plastic. 
D) air. 
E) is the same in each of these

Question 10

Your image in a plane mirror is

Accepted Answer

A) virtual. 
B) real. 
C) both of these 
D) neither of these 
A) virtual. 
B) real. 
C) both of these 
D) neither of these

Question 11

When white light goes from air into water,the color that refracts the most is

Accepted Answer

A) red. 
B) orange. 
C) green. 
D) violet. 
E) All refract the same amount. 
A) red. 
B) orange. 
C) green. 
D) violet. 
E) All refract the same amount.

Question 12

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

Accepted Answer

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

Question 13

When you look at yourself in a pocket mirror,and then hold the mirror farther away,you see

Accepted Answer

A) more of yourself. 
B) less of yourself. 
C) the same amount of yourself. 
A) more of yourself. 
B) less of yourself. 
C) the same amount of yourself.

Question 14

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

Accepted Answer

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

Question 15

If you wish to send a beam of laser light to a space station that is just above the atmosphere near the horizon,you should aim your laser

Accepted Answer

A) above your line of sight. 
B) below your line of sight. 
C) along your line of sight. 
A) above your line of sight. 
B) below your line of sight. 
C) along your line of sight.

Question 16

A diver shines light up to the surface of a smooth pond at a 10-degree angle to the normal.Some light passes into the air above,and the part that reflects back into the water makes an angle to the normal of

Accepted Answer

A) less than 10 degrees. 
B) 10 degrees. 
C) more than 10 degrees. 
A) less than 10 degrees. 
B) 10 degrees. 
C) more than 10 degrees.

Question 17

Light refracts when traveling from air into glass because light

Accepted Answer

A) has greater intensity in air than in glass. 
B) has greater intensity in glass than in air. 
C) has greater frequency in air than in glass. 
D) has greater frequency in glass than in air. 
E) travels slower in glass than in air. 
A) has greater intensity in air than in glass. 
B) has greater intensity in glass than in air. 
C) has greater frequency in air than in glass. 
D) has greater frequency in glass than in air. 
E) travels slower in glass than in air.

Question 18

Atmospheric refraction tends to make daytimes

Accepted Answer

A) longer. 
B) shorter. 
C) no change in day length 
A) longer. 
B) shorter. 
C) no change in day length

Question 19

To see his full height,a boy that is 1 meter tall needs a mirror that is at least

Accepted Answer

A) 0)33 m tall. 
B) 0)50 m tall. 
C) 0)75 m tall. 
D) 1 m tall. 
E) depends on how far the mirror is from the boy 
A) 0)33 m tall. 
B) 0)50 m tall. 
C) 0)75 m tall. 
D) 1 m tall. 
E) depends on how far the mirror is from the boy

Question 20

Diffuse reflection occurs when the size of surface irregularities is

Accepted Answer

A) small compared to the wavelength of the light used. 
B) large compared to the wavelength of the light used. 
C) microscopic. 
A) small compared to the wavelength of the light used. 
B) large compared to the wavelength of the light used. 
C) microscopic.

Exam 28: Reflection and Refraction

Light travels fastest in

Use the following figure to answer the question: -From what you know about the refraction of various wavelengths of visible light,would red light and blue light from the same source produce images at the same place?

Fermat's principle of least time applies to

When seen from an airplane,a rainbow sometimes forms a complete circle.When this happens,the plane's shadow is

Fermat's principle of least time could also be the principle of least distance for the case of

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

You wish to photograph the image of your little sister,who is standing 2 meters from a plane mirror.Holding the camera beside her head,you should set the distance for

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

A beam of light travels fastest in

Your image in a plane mirror is

When white light goes from air into water,the color that refracts the most is

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

When you look at yourself in a pocket mirror,and then hold the mirror farther away,you see

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

If you wish to send a beam of laser light to a space station that is just above the atmosphere near the horizon,you should aim your laser

A diver shines light up to the surface of a smooth pond at a 10-degree angle to the normal.Some light passes into the air above,and the part that reflects back into the water makes an angle to the normal of

Light refracts when traveling from air into glass because light

Atmospheric refraction tends to make daytimes

To see his full height,a boy that is 1 meter tall needs a mirror that is at least

Diffuse reflection occurs when the size of surface irregularities is

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