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![[Post New]](/templates/default/images/icon_minipost_new.gif) 10 May 2008 11:34:17 IST
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fringe width r respectively
lambda 1D/d and lambda 2 D/d
the maxima will coincide again when ....
let suppose after m fingesn n fringes d fringes of both overlap .......
that means ....after.....LCM of both d fringe widths ........
hence d ans
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