First slide

Young's double slit Experiment

Question

Two coherent sources of light interfere and produce fringe pattern on a screen. For central maximum, the phase difference between the two waves will be,

Very Easy

A

$\frac{π}{2}$
B

Zero
C

$π$
D

$\frac{3 π}{2}$

Solution

For central maximum, path difference is zero hence phase difference for coherent sources of light will be zero.
$∵ ϕ = \frac{2 π}{λ} Δx$
where $∆$ x is path difference and $ϕ$ is phase difference.

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