Consider a light ray travelling in air is incident into a medium of refractive index $\sqrt{2n}$. The incident angle is twice that of refracting angle. Then, the angle of incidence will be :

Question

${\sin ^{ - 1}}\left( {\sqrt n } \right)$

${\cos ^{ - 1}}\left( {\sqrt {{n \over 2}} } \right)$

${\sin ^{ - 1}}\left( {\sqrt {2n} } \right)$

$2{\cos ^{ - 1}}\left( {\sqrt {{n \over 2}} } \right)$

Solution

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