A well-cut diamond appears bright because | vedclass

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(C) The refractive index $\mu$ of a diamond is very high (approximately $2.42$).Since the critical angle $	heta_c$ is given by the relation $\sin 	h

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of its total internal reflection

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(C) The refractive index $\mu$ of a diamond is very high (approximately $2.42$).Since the critical angle $	heta_c$ is given by the relation $\sin 	heta_c = \frac{1}{\mu}$,a high refractive index results in a very small critical angle.When light enters a well-cut diamond,it strikes the internal surfaces at angles greater than the critical angle.This leads to multiple total internal reflections within the diamond.Consequently,the light is trapped and reflected multiple times,making the diamond appear bright.

$A$ well-cut diamond appears bright because

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