What is double refraction?

In double refraction .

In double refraction .

A : One of the images in double refraction doesn't obey the principles of refraction. R : Extraordinary image in double refraction doesn't obey the principles of refraction because its velocity changes with direction.

What is lateral refraction of light ?

Consider the following statements A and B. Identify the correct choice in the given answer A. The refractive index of the extraordinary ray depends on the angle of incidence in the double refraction. B. The vibration of light waves acquire one sided ness of both ordinary and extraordinary rays in double refraction.