Question

A. Derive an expression for the
fringe width of interference pattern​

Answer 1

Answer: Derive expression for fringe width in interference pattern

Let d = distance between the slits (two sources). P = a point at a distance from the middle of the screen where a bright fringe is formed. S2P – S1P = nλ where n = 0,1,2,3……. Since the fringes are equally spaced the distance between two consecutive bright or consecutive dark fringes gives fringe width

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