Single correct option
The sparkling of a diamond is mainly due to
- A. scattering of light
- B. diffraction of light
- C. total internal reflection
- D. polarisation of light
Show answer and solution
Answer: (C) total internal reflection
Diamond has a very high refractive index of about 2.42, so its critical angle is only about 24 degrees. Light entering it undergoes repeated total internal reflection before leaving, which makes it sparkle. Dispersion adds colour, but the brilliance comes from total internal reflection.
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