The brilliant plumage of what national bird of india is due to an optical interference phenomenon called the bragg reflection?

The correct answer is the peacock. The plumage found in Indian peacocks are because of the Bragg reflection phenomenon.

Explanation:

Bragg's law, or Wulff-Bragg's position, a special event of Laue diffraction, gives the plans for coherent and incoherent scattering from a crystal lattice. When X-rays are conflicted on an atom, they make the electronic cloud move as does an electromagnetic wave and it is observed in peacock.

The correct answer is the peacock. The plumage found in Indian peacocks are because of the Bragg reflection phenomenon.