First slide

Young's double slit Experiment

Question

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

Moderate

A

Phase difference of $3 π$
B

Phase difference of $5 π / 2$
C

Path difference of $3 λ$
D

Path difference of $5 λ / 2$

Solution

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

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