figure shows three equidistant slits illuminated by a monochromatic parallel beam of light. L
Channel: Doubtnut
Date: 2020-07-12

figure shows three equidistant slits illuminated by a monochromatic parallel beam of light. Let `BP_0 -AP_0 = lambda/3` and `Dgtgtlambda`.   (a) Show that d = `sqrt ((2lambdaD)//3)`  (b) Show that the intensity at `P_0` is three times the intensity due to any of the three slits  individually.