First slide

Young's double slit Experiment

Question

Intensity at a point due to Young's double slit experiment remain same when the two identical sources are coherent or incoherent. The phase difference between the two waves when they are coherent is

Moderate

A

$π$
B

$\frac{π}{2}$
C

$\frac{2 π}{3}$
D

$\frac{π}{3}$

Solution

$\begin{array}{l} \end{array}$ when sources are incoherent intensity at any point is $I_{0} + I_{0} = 2 I_{0}$ but when they are coherent $I = 4 I_{0} \cos^{2} \frac{φ}{2} = 2 I_{0}$

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