Question
In a Young's double slit experiment if there is no initial phase difference between the light from the two slits, a point on the screen corresponding to the fifth minimum has path difference
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Answer
Path difference for $n^{\text {th }}$ minima $=(2 n-1) \frac{\lambda}{2}$
For fifth minima $(n=5)=\frac{9 \lambda}{2}$
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