Physics - Wave Optics Question with Solution | TestHub

Interference pattern is observed at ' $\mathrm{P}$ ' due to superimposition of two rays coming out from a source ' $S$ ' as shown in the figure. The value of ' $\mathrm{l}$ ' for which maxima is obtained at ' $\mathrm{P}$ ' is: ( $\mathrm{R}$ is perfect reflecting surface)