Question

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

विकल्प

• The entire spectrum of visible light will come out of the water at an angle of 90° to the normal.

• The spectrum of visible light whose frequency is less than that of green light will come out to the air medium.

• The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.

• The entire spectrum of visible light will come out of the water at various angles to the normal.

Answer 1

The spectrum of visible light whose frequency is less than that of green light will come out to the air medium.

Explanation:

`sin i_C = 1/n` and `n prop 1/lambda`

For greater wavelength (i.e., lesser frequency) n is less. Hence, i_C would be more. Thus, these wavelengths will not suffer internal reflection and come out at angles less than 90°.