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  4. In a Young' 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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Q. In a Young' 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.

NEETNEET 2019Wave Optics

Solution:

Path difference for $n^{th}$ minima $=(2n - 1) \frac{\lambda}{2}$
For fifth minima $(n = 5) = \frac{9\lambda}{2}$