Physics - Wave Optics Question with Solution | TestHub

Two plane mirrors are placed parallel to each other at a distance$4d$as shown in the figure. The point source of light S is having wavelength equal to$\mathrm{\lambda }$. The light is reaching the screen (right of the source) only after reflection. For point$\mathrm{P}$to be 2nd maxima, the value of$\frac{\mathrm{\lambda }}{2}=\frac{\mathrm{K}{\mathrm{d}}^2}{\mathrm{D}}$. Where$\mathrm{K}$is an integer. Find value of$\mathrm{K}$? (assume$\mathrm{ }\mathrm{D}\gg \mathrm{d}$and$\mathrm{d}\gg \mathrm{\lambda }$)