Brilliance of diamond is due to

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(D) $ (d) $ Total internal reflection can occur only when a ray is incident on the surface of a medium whose refractive index is smaller than that of

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Total internal reflection

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(D) $ (d) $ Total internal reflection can occur only when a ray is incident on the surface of a medium whose refractive index is smaller than that of the medium in which the ray is travelling. Since the refractive index of air is $ 1.00029 $ and that of diamond is $ 2.42, $ the critical angle for diamond-air interface is very small. When light enters a diamond,it undergoes multiple total internal reflections due to its specific cut,which causes the brilliance of the diamond.

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