Question

A wave travelling in air falls on a glass plate, It is partly reflected and partly refracted. The phase difference between the reflected and refracted waves is

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

Answer 1

Answer: (C)

$\pi$

The incident wave and reflected wave are always in phase whereas incident wave and refracted waves has phase different of $\pi$. Therefore, phase difference between reflected wave and refracted phase is again $\pi$.