Waves Practice Problem Set Worksheet Page 22
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ECHANICS
RACTICE
ROBLEM
ETS
8.2
R
L
EFRACTION AND
ENSES
8.2.1 Refraction
1. Calculate the index of refraction for a clear plastic material if the velocity of light in
8
that material is 2.5 x 10
m/s.
Answer: 1.20
a. A ray of light in air is incident at an angle of 40.8° on the surface of this clear
plastic material. What is the angle of refraction in the plastic? Answer: 33°
2. A ray of light passes from kerosene to crown glass (n = 1.52) at an angle of incidence
of 45.2°. If the angle of refraction in the glass is measured to be 41°, what is the index
of refraction for kerosene?
Answer: 1.39
3. A ray of light passes from air into a glass prism at an angle of incidence of 35°. If the
angle of refraction in the glass is 23.7°, what is the speed of light in the glass?
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Answer: 2.1 x 10
m/s
4. What is the critical angle for a light ray passing into air from polystyrene that has an
index of refraction of 1.60?
Answer: 38.7°
5. A light source is located 2.0 m below the surface of a swimming pool and 1.5 m from
the edge. The pool is filled to the top with water.
a. At what angle does the light reaching the edge of the pool leave the water?
Answer: 53.0° from the normal
b. Does this cause the light viewed from this angle to appear deeper or shallower
than it actually is. Explain your answer using a diagram!
6. A fiber optic cable (n=1.50) is submerged in water (n=1.33). What is the critical angle
for the light to stay inside the cable?
Answer: 62.4°
7. A certain kind of glass has an index of refraction of 1.65 for blue light and an index
of refraction of 1.61 for red light. If white light (containing all colors) is incident on
the glass at an angle of 30°, what is the angle between the red and blue light inside the
glass?
Answer: 0.45°
8. A laser is incident hits a glass prism that is the shape of an equilateral triangle as
shown below. Draw a ray diagram to show what happens to the light ray when it
interacts with the prism.
a. Calculate the angle at which the laser beam leaves the prism.
Answer: 75°
Gamzon & Gregorian-Michaelsen
6/7/16
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