First slide

Young's double slit Experiment

Question

If yellow light in the Young's double slit experiment is replaced by red light, the fringe width will

Moderate

A

Decrease
B

Remain unaffected
C

Increase
D

First increase and then decrease

Solution

Fringe width $(β) = \frac{Dλ}{d} \Rightarrow β \propto λ$
As $λ_{red} > λ_{yellow}$ hence fringe width will increase.

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