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

Question

$\sin^{-1}(\tan i)$

$\tan^{-1}(\sin i)$

$\sin^{-1}(\cot i)$

$\cos^{-1}(\tan i)$

Solution

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