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Question:

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

the entire spectrum of visible light will come out of the water at 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.

Solution:

As frequency of visible light increases refractive index increases and critical angle decreases. Therefore, light having frequency greater than green will get total internal reflection and the light having frequency less than green will come out to the air medium.