Question

When a wave undergoes reflection at a denser medium, what will be the phase change?

(a) 2π radian

(b) 0

(c) π radian

(d) 3π radian

The question was asked in my homework.

This interesting question is from Wave Optics topic in division Wave Optics of Physics – Class 12

Answer 1

Right answer is (c) π radian

The best explanation: When a wave is reflected in the rarer medium from the surface of a denser medium, it undergoes a phase change of π radian. Therefore, when a wave undergoes reflection at a denser medium, the phase change will be π radian.