A ray of light travelling in a rarer medium, strikes a plane boundary between the rarer medium and a denser medium at an angle of incident 'i' such that the reflected and the refracted rays are mutually perpendicular. Another ray of light of same frequency is incident on the same boundary from the side of denser medium. Find the minimum angle of incidence at the denser-rarer boundary so that the second ray is totally reflected.

A ray of light travelling in a rarer medium, strikes a plane boundary

1.	A ray of light travelling in a rarer medium, strikes a plane boundary between the rarer medium and a denser medium at an angle of incident 'i' such that the reflected and the refracted rays are mutually perpendicular. Another ray of light of same frequency is incident on the same boundary from the side of denser medium. Find the minimum angle of incidence at the denser-rarer boundary so that the second ray is totally reflected.
Answer» SOLUTION :`theta_C = SIN^(-1) ( COT i)`

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