Write the necessary conditions to obtain sustained interference fringes.
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14) (a) Write the necessary conditions to obtain sustained interference fringes.
(b) In Young'a double slit experiment, plot a graph showing the variation of fringe width versus the distance of the screen from the plane of the slits keeping other parameters same. What information can one obtain from the slope of the curve ?
(c) What is the effect on the fringe width if the distance between the slits is reduced keeping other parameters same ?
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