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A ray of light passes from a denser medi...

A ray of light passes from a denser medium to a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of `90^@` with each other. The angle of reflection and refraction are resepectively r and r'. The critical angle is given by :

A

`sin^(-1) (cot r)`

B

`tan^(-1) (sini)`

C

`sin^(-1) (tanr')`

D

`sin^(-1)(tanr)`

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