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Give the formula for the linear separati...

Give the formula for the linear separation of bright and dark fringes.

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(a) For bright fringes `x=pm n beta , n =1,2,3,4,........`
(b) For dark fringes `x=pm(2n+I)(beta)/(2)` Where `beta=(lambda D)/(d) and n=0,1,2,3,…....`
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