Physics

Physics

Problem

A ray of light incident on the horizontal surface of glass slab at 70∘70^\circ just grazes the adjacent vertical surface after refraction. Compute the critical angle and refractive index. (sin⁡70∘=0.9397\sin 70^\circ = 0.9397, sin⁡−1(0.7289)=46∘47′\sin^{-1}(0.7289) = 46^\circ 47')

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