Question

A wave travelling in a rarer medium to a denser medium undergoes a phase change of

Answer 1

Explanation:

When a wave is reflected into rarer medium from the surface of a denser medium, it undergoes a phase change of π radian.

Answer 2

Answer:

When lightwave is refracted from rarer media to denser media, the lightwave direction changes towards the normal drawn on the point of refraction. Although the phase of the lightwave does not alter.

Thus the phase difference occurring due to refraction is zero.