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A ray of light enters from a rarer to a ...

A ray of light enters from a rarer to a denser medium. The angle of incidence is I . Then the reflected and refracted rays are mutually perpendicular to each other . The critical angle for the pair of media is

A

`cos^-1 (tan i)`

B

`sin^-1 (cot i)`

C

`tan^-1 (sin i)`

D

`sin^-1(tan i)`.

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