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If a ray of light in a denser medium str...

If a ray of light in a denser medium strikes a rarer medium at an angle of incidence `i`, the angle of reflection and refraction are respectively r and r', if the reflected and refracted rays are at right angles to each other, the critical angle for the given pair of media is

A

`tan^-1(sin i)`

B

`cot^-1(tan i)`

C

`sin^-1(tan r')`

D

`sin^-1(tan r)`.

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