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  4. In Young's double slit experiment, when two light waves form third minimum, they have

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Q. In Young's double slit experiment, when two light waves form third minimum, they have

Wave Optics

Solution:

For minima, path difference $\Delta=(2 n-1) \frac{\lambda}{2}$
For third minima $n=3$
$ \Rightarrow \Delta=(2 \times 3-1) \frac{\lambda}{2}=\frac{5 \lambda}{2}$