JEE Advanced 2007 Physics question

A ray of light traveling in water is incident on its surface open to air. The angle of incidence is θ, which is less than the critical angle. Then there will be

(A)only a reflected ray and no refracted ray
(B)only a refracted ray and no reflected ray
(C)a reflected ray and a refracted ray and the angle between them would be less than 180° − 2θCorrect
(D)a reflected ray and a refracted ray and the angle between them would be greater than 180° − 2θ

Answer: (C)

Solution

Below the critical angle the light is partly reflected and partly refracted, so both rays exist ((A) and (B) are wrong). The reflected ray makes angle θ with the normal (in water) and the refracted ray makes angle

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Question ID VK-037410