Let the refractive index of a denser medium with respect to a rarer medium be n12 and its critical angle be θC . At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90o. Angle A is given by :

Question

Let the refractive index of a denser medium with respect to a rarer medium be n₁₂ and its critical angle be θ_C . At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90^o. Angle A is given by :

${1 \over {{{\cos }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$

${1 \over {{{\tan }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$

${\cos ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$

${\tan ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$

Solution

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