Which of the following optical phenomena is solely responsible for the brilliant sparkling of a cut diamond under incident light?

💡 Solution & Explanation

The brilliant sparkle of a cut diamond is primarily caused by total internal reflection occurring repeatedly inside the crystal facets because its critical angle is exceptionally small at approximately twenty-four degrees. When light enters the precisely angled cuts of a diamond, it undergoes multiple internal reflections before emerging out of specific top faces, concentrating light intensity. Thin film interference produces colorful soap bubbles, while polarization and diffraction explain wave nature phenomena.