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Class 8-9-10, JEE & NEET
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Consider the arrangement shown in figure. The distance $D$ is large compared to the separation $d$ between the slits.
(a) Find the minimum value of $d$ so that there is a dark fringe at $O$.
(b) Suppose $d$ has this value. Find the distance $x$ at which the next bright fringe is formed.
(c) Find the fringe-width.