Question
In Young’s double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponds to the 5th minimum. What is the path difference?

Answer

Path difference $\Delta I =(2 n -1) \frac{\lambda}{2}=(2 \times 5-1) \frac{\lambda}{2}=\frac{9 \lambda}{2}$

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