In Young's double slit experiment slit s...

In Young's double slit experiment slit separation is d, and distance of screen from slate is D (D>>d). If first dark fringe is formed in front of one of the slit, then web length of light used will be

`3d^2/(2D)`

`d^2/(2D)`

`3D^2/(2d)`

`d^2/D`

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