Question

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. If
reflected and refracted rays make an angle of 90° with each other and the angle of refraction then the critical angle for the pair of media is :
(A) sin^-1 (tan i)
(B) cos^-1 (tan r)
(C) tan^ -1(sin r)
(D) tan^-1 (sin i)
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Answer 1

Answer:

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of π/2 with each other.