Question

Diamonds glitter in the dark because ______.

Options

• they emit light

• they have a very small critical angle due to very high refractive index

• they exhibit fluorescence

• the chemical reaction in the diamond produces light energy

Answer 1

Diamonds glitter in the dark because they have a very small critical angle due to very high refractive index.

Explanation:

Diamond has a high refractive index (2.42), which makes its critical angle very small (24.4°). Light entering it easily undergoes multiple total internal reflections, creating a brilliant glitter.