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A bright fringe is formed in front of on...

A bright fringe is formed in front of one of the double slits. What will be the fringe width of the interference pattern?

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`beta=(lambda D)/(d)`
and `x=n beta` for `C.I.`
Here, `x=(d)/(2) and n=1`
or `lambda=(d^2)/(2D)` and the fringe width `beta=(lambda d)/(2)`.
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