The luster of diamond is due to

A. Reflection
B. Total internal reflection
C. Refraction
D. None of these

Check Answer

The correct answer is B. Total internal reflection.
The luster, or sparkle, of a diamond, is due to its high refractive index and ability to exhibit total internal reflection. When light enters a diamond, it is refracted or bent due to the high density of the diamond. This causes the light to slow down and change direction. If the angle of incidence of the light is such that it is greater than a certain critical angle, the light will be totally reflected back inside the diamond instead of passing through it. This creates a sparkling effect known as “fire” that gives diamonds their characteristic luster.
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