Physics - Wave Optics Question with Solution | TestHub

In the arrangement shown in the figure, slits${\mathrm{S}}_3$and${\mathrm{S}}_4$are having a variable separation$Z$. Point$\mathrm{O}$on the screen is at the common perpendicular bisector of${\mathrm{S}}_1{\mathrm{S}}_2$and${\mathrm{S}}_3{\mathrm{S}}_4$. (Assume$D>>d$)



The minimum value of$Z$for which the intensity at$\mathrm{O}$is zero is