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how to find the no: of fringes????????????????pls explain
as we know from the basic theory, the distance of screen from the slits is D, the point P is at a distance of y from the central maxima, Hencey= nλD/dand d is the sepearation between two slitsif the slita are moving apart with the realtive velocity of vso the separation d is changing with time as vd = vtHence, y= nλD/vtrearrage them, we get n/t = yv/λD.Hope it is clear.
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