Let the refractive index of a denser medium with respect to 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
Held on 8 Apr 2017 · Verified 6 Jul 2026.
tan−1(sinθC)
tan−1(sinθC)1
cos−1(sinθC)
cos−1(sinθC)1
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