In the arrangement shown, a screen is pl...

In the arrangement shown, a screen is placed normal to the line joining the two point coherent sources `S_(1)` and `S_(2)`. The interference pattern consist of concentric circles. `lambda` is the wavelength of light `(D gt gt d)`.

The radius of the `n^(th)` bright ring is

`(n lambda D)/(d)`

`(1-(n lambda D)/(d))`

`Dsqrt(1-(n lambda)/(d))`

`Dsqrt(2(1-(n lambda)/(d)))`

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