Question

The phase change in reflected wave, when light wave suffers reflection at the interface from air to glass is

• A. $0$
• B. $\frac{\pi }{2}$
• C. $\pi$
• D. $2\pi$

Answer 1

The correct option is C $\pi$

When a light is reflected from denser to rarer medium, there is no phase change in the light but when a light is reflected from rarer to denser medium, there is a phase change of $\pi$. So, here the air is rarer than glass and hence there is a phase change of $\pi$.

Hence, option $\left(\text{C}\right)$ is correct.