Q.

The sparkling of a diamond is due to –

A. total internal reflection of light
B. interference of light
C. polarisation of light
D. refraction of light
Answer» A. total internal reflection of light
Explanation: Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
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