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In the arrangement shown in Fig., slits ...

In the arrangement shown in Fig., slits `S_(1)` and `S_(4)`are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of `S_(1) S_(2)` and `S_(3) S_(4)`.

The minimum value of Z for which the intensity at O is zero is

A

`(lambdaD)/(d)`

B

`(2lambdaD)/(d)`

C

`(lambdaD)/(2d)`

D

`(lambdaD)/(3d)`

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The correct Answer is:
A
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