Question
In Young's double-slit experiment, if the path difference at a certain point on the screen is $7.4999 \lambda$ what can you say about the nature of the illumination at that point ?

Answer

The point will be nearly dark as the path difference $=7.4999 \lambda \approx(8-0.5) \lambda$, which is of the form
$\left(m-\frac{1}{2}\right) \lambda$ where $m=1,2, \ldots .8\

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