In Young's double experiment , in air ...

In Young's double experiment , in air interference pattern second minimum is observed exactly in front of one slit. The distance between the two coherent source is 'd' and the distance between source and screen 'D'. The wavelength of light source used is

`(d^2)/D`

`(d^2)/(2D)`

`(d^2)/(3D)`

`(d^2)/(4D)`

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