Previous year MCQs

General science UPPSC 2017 GS-I
Question

A cut diamond shines brilliantly due to:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: total internal reflection

Detailed Solution:

The correct answer is “total internal reflection”.
A cut diamond shines brilliantly due to total internal reflection.

Diamonds have a high refractive index, meaning they bend light significantly. When light enters a diamond and strikes its internal facets at a specific angle, it undergoes total internal reflection.

This means the light bounces back inside the diamond instead of escaping, creating multiple reflections and a dazzling display of light.

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