Question

A wave traveling in a rarer medium on refraction into a denser medium undergoes phase change of

• A. Zero
• B. $\pi /2$
• C. $\pi$
• D. $2\pi$

Answer 1

The correct option is A Zero

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.