Physics - Wave Optics Question with Solution | TestHub

In the given arrangement, the slits$S_1$and$S_2$are fixed at small separation$d$while the slits$S_3$and$S_4$have variable separation$z$. The screen is fixed and the slits are symmetric with respect to the centre of the screen. A parallel beam of light is incident as shown in figure.



The minimum value of separation$z$so that the intensity at$O$is zero is