Light, Deviation, Index of Refraction and Snell's Law Review

Question 1

The bending or redirection of a light wave when it passes a barrier without changing the medium in which is it traveling is called:

Answer 1

Diffraction

Question 2

When a light ray travels from one transparent medium to another, it changes direction. This bending of light, which results from the differences in density of different transparent materials, is called:

Answer 2

Refraction

Question 3

When a ray of light travels from one material to another, if its direction of travel is perpendicular or normal to the interface or junction between the materials, it will:

Answer 3

Change speed, but not direction

Question 4

When a ray of light travels from a less dense material to a denser material at an angle to the normal, it will:

Answer 4

bend towards the normal

Question 5

When a ray of light travels from a denser material to a rarer material at an angle to the normal, it will:

Answer 5

Bend away from the normal

Question 6

When a ray of light leaves the crown glass, its angle with the normal to the surface is only 8 degrees. If it has an angle of refraction of 12 degrees, what is the angle of deviation when it leaves the glass?

Answer 6

-4 degrees

Question 7

If a ray of light is incident on a material at an angle of 18 degrees, and it is deviated by 7 degrees, what is its angle of refraction?

Answer 7

11 degrees

Question 8

When a ray of light travels from a denser medium to a rarer medium, r is greater than i and d is negative

Answer 8

False

Question 9

When a ray of light travels from a rarer medium to a denser medium, r is less than i and d is positive

Answer 9

True

Question 10

A ray of light travels from one material to another. The angle of incidence is 45 degrees and the angle of refraction is 65 degrees. Is the angle of deviation -20 degrees or 20 degrees?

Answer 10

-20 degrees

Question 11

A ray of light is deviated by -10 degrees from its path when it passes from one material into another material. If it was originally traveling at an angle of 29 degrees to the normal, is it traveling into the denser material, or is it exiting the denser material?

Answer 11

exiting the denser material

Question 12

A ray of light traveling from air into crown glass (1.523) strikes the surface at an angle of 30 degrees. What will the angle of refraction be? (Remember Snell’s Law: n1sin(i)=n2sin(r)

Answer 12

19.16558901, or 19 degrees

Question 13

If light travels through a liquid at 140,000 miles/second, what is the index of refraction of the liquid? Keep in mind that the speed of light through air is 186,000 miles/second

Answer 13

1.32

Question 14

If light traveling through air (186,000 miles/second) encounters a second medium which slows the light to 100,000 miles/second, what is the index of the second medium?

Answer 14

1.86

Question 15

What is the index of refraction of a refractive medium if the angle of incidence in air is 30 degrees and the angle of refraction in 15 degrees? (Remember Snell’s Law: n1sin(i)=n2sin(r)

Answer 15

2.00

Question 16

What is the angle of refraction in water if the angle of incidence in air is 40 degrees? Remember that the index of water is 1.333

Answer 16

29 degrees

Question 17

What is the index of refraction of a liquid if the angle of incidence in air is 35 degrees and the angle of refraction is 14 degrees? (Remember Snell’s Law: n1sin(i)=n2sin(r)

Answer 17

2.37

Question 18

A ray of light exits from a material with an index of 1.80, traveling into air. If the angle of refraction is 20 degrees, what was the original angle of incidence? (Remember Snell’s Law: n1sin(i)=n2sin(r)

Answer 18

11 degrees

Question 19

A ray of light exits from a material with an index of 1, traveling into water (1.33). If the angle of refraction is 20 degrees, what was the original angle of incidence? (Remember Snell’s Law: n1sin(i)=n2sin(r)

Answer 19

27 degrees

Question 20

What formula is used for calculating the angle of deviation?

Answer 20

i = r + d

Question 21

What formula is used for calculating the index of refraction?

Answer 21

Speed of light in air/speed of light in medium

Question 22

Which formula is used for calculating the angle of refraction?

Answer 22

n1sin(i) = n2sin(r)