First slide

Coherent sources and their importance in interference

Question

In Young's experiment, the distance between the slits is reduced to half and the distance between the slit and screen is doubled, then the fringe width

Easy

A

Will not change
B

Will become half
C

Will be doubled
D

Will become four times

Solution

$β = \frac{λD}{d} \Rightarrow$ If D becomes twice and d becomes half so $β$ becomes four times.

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