A green light is incident from the water to the air - water interface at the critical angle `(theta)`. Select the correct statement.

Options

A. The entire spectrum of visible light will come out of the water at various angles to the normal.
B. The entire spectrum of visible light will come out of the water at an angle of `90^(@)` to the normal
C. The spectrum of visible light whose frequency is less than that of green light will come out to the air medium
D. The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.

Answer

D

Explanation

Critical angle `theta=sin^(-1)((1)/(mu))`
The refractive index is dependent on frequency of light. For the light components having frequency less than that of green light the refractive index will be small and critical angle will be greater so they will emerge out in air, other components having greater frequencies will suffer total internal reflection.