Question

The crystal of diamond shines due to

• A. high density
• B. total internal reflection
• C. crystal lattice
• D. None of the above

Answer 1

Answer: (B)

total internal reflection

Answer 2

The faces of diamond are cut in such a way that whenever light falls on any of the face, the angle of incidence is greater than the critical angle, that is $24^\circ$. So, when light falls on diamond, it suffers repeated internal reflections. When this reflected light emerges out, one gets the diamond sparkle.