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In Young double slit experiment, when two light waves form third minimum, they have

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Phase difference of $3 π$

Phase difference of $\frac{5 π}{2}$

$Path difference of 3 λ$

$Path difference of \frac{5 λ}{2}$

answer is D.

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Detailed Solution

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

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