Question

A beam of light passing through a flint glass is incident on water. The index of refraction of water is 1.33 and the index of refraction of flint glass is 1.62. a. What is the critical angle of light that passes from the flint glass to water? b. What happens to the path of light if the angle of incidence is 60º? c. What happens to the value of the critical angle if the flint glass is replaced by a diamond? The index of refraction of diamond is 2.42.

Answer 1

• The critical angle of the light is 38.1 degrees
• The light will udergo total internal reflection
• The critical angle further decreases.

What is refractive index?

The term refractve index refers to the value that shows the extent of bending of light waves as it travels from one medium to another.

a) Recall that;

n = 1/sinC

where C = critical angle

C = sin-1(1/n)

C = sin-1 (1/1.62)

C = 38.1 degrees

b) Since the angle of incidence has exceeded the critical angle, then there is total internal reflection of light.

c) If the flint glass id replaced by diamond;

C = sin-1(1/n)

C = sin-1 (1/2.42)

C = 24.4

The critical angle further decreases.

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