explain theory of interference band and find the expression for bandwidth
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Expression for bandwidth of interference fringes in youngs double experience : Let d be the distance between two coherent sources A and B of wavelength λ. A screen XY is placed parallel to AB at a distance D from the coherent sources. C is the mid point of AB. O is a point on the screen equidistant from A and B.P is a point at a distance x from O, as shown in figure. Waves from A and B meet at P in phase or out of phase depending upon the path difference between two waves.
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