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(a) In Young's double slit experiment, d...

(a) In Young's double slit experiment, describe briefly how bright and dark frings are obtained on the screen kept in front of a double slit. Hence obtain the expression for the fringe width.
(b) The ratio of the intensities at minima to the maxima in the Young's double slit experiment is 9 : 25. Find the ratio of the widths of the two slits.

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