Q 1232634532.     A ray of light from a denser medium strikes a rarer medium at an angle of incidence `i` as shown in the figure. The reflected and refracted rays make an angle of `90^°` with each other. The angles of reflection and refraction are `r` and `r'` respectively. Find the critical angle.

JEE 1983
A

`sin^(–1)(cot i)`

B

`tan^(–1) (sin i)`

C

`sin^(–1) (tan r)`

D

`sin^(–1) (tan r’ )`

HINT

Snell's law.

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