Question

Two waves of same wavelength and amplitude interfere to produce a minimum when phase difference is

• A. $0$
• B. $\frac{\pi }{2}$
• C. $\pi$
• D. $\frac{3\pi }{2}$

Answer 1

The correct option is C $\pi$

To produce minimum interference the phase difference should be odd integer time $\pi$

$\Delta \varphi =(2n-1)\pi$ where n should be a integer

for n=1

$\Delta \varphi =\pi$