First slide

Young's double slit Experiment

Question

In Young's double slit experiment, the separation between the slit is halved and the distance between the slits and screen is doubled, The fringe width is

Easy

A

unchanged
B

halved
C

double
D

quadrupled

Solution

The fringe width
$β = \frac{λD}{2 d} and β^{'} = \frac{λ (2 D)}{d}$
$β^{'} = 4 β$
When the separation between the slits is halved and D is doubled, p becomes four times.

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