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

Answer

A, B, C, D

Explanation

For critical angle C,
`sinC=(1)/(mu)` …(1)

For the wave of large wavelength (small frequency), refractive index u is small and from equation (1), if u is small, then critical angle C will be large.
Hence if light of smaller frequency is reflected then it will refract at less than `90^@`.