First slide

Coherent sources and their importance in interference

Question

In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes

Easy

A

$\frac{1}{3} times$
B

$\frac{1}{9} times$
C

3 times
D

9 times

Solution

$β \propto \frac{1}{d} \Rightarrow If d becomes thrice, then β become becomes \frac{1}{3} times.$

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