Consider the arrangement shown in figure, By some mechanism, the separation between the slits S_(3) and S_(4) can be changed. The intensity is measured at the pointP which is atthe common perpendicular bisector of S_(1)S_(2) and S_(3)S_(4). When z = (D lambda)/(2d), the intensity measured at P is I. Find this intensity when z is equal to 1) (D lambda)/(d), (2) (3Dlambda)/(2d) and (3) (2D lambda)/(d).

Consider the arrangement shown in figure, By some mechanism, the separ

1.	Consider the arrangement shown in figure, By some mechanism, the separation between the slits S_(3) and S_(4) can be changed. The intensity is measured at the pointP which is atthe common perpendicular bisector of S_(1)S_(2) and S_(3)S_(4). When z = (D lambda)/(2d), the intensity measured at P is I. Find this intensity when z is equal to 1) (D lambda)/(d), (2) (3Dlambda)/(2d) and (3) (2D lambda)/(d).
Answer» O, I, 2I I, O, 2I 2I, O, I I, 2I, 3I Answer :A

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