Question

A wave train is moving along light thread it is reflected from heavy threads, then the phase difference between incident & reflected wave at boundary is:

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

Answer 1

The correct option is D $\pi$

$\Delta \varphi$ between incident & reflected $=\pi$ (if reflected from dense)