Question

why does diamond shines

Answer 1

diamonds are cut so that a light ray falling on the diamond is reflected multiple times inside the diamond and therefore sends light out in all direction.

Answer 2

Critical angle for diamond is only 24 degree. Moreover,diamonds are cut at very sharp angle, making a number of refractive surfaces. When a ray of light enters a diamond, it suffers a series of total internal reflection because of the very small value of the critical angle. Thus, the ray in a way gets trapped within the diamond for sometime. It is this trap light energy, which makes it sparkle.

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