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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 angles of reflection and refraction are respectively, r and r' If the reflected and refraction rays are at right angles to each other, the critical angle for the given pair of media is

A

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

B

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

C

`sin^(-1) (tan r')`

D

`tan^(-1)(sin r')`

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The correct Answer is:
A
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