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[" In Young's double slit experiment,"5" th dark "],[" fringe is obtained at a point,"5" th dark "],[" transparent film is placed in the path of one of "],[" waves,then "7" th bright fringe is obtained at the "],[" same point.The thickness of the film in terms "],[" be "],[1.5 lambda],[(mu-1)^(2))1.5(mu-1)lambda3)2.5(mu-1)lambda(4)](2.5 lambda)/((mu-1))]

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