First slide

Coherent sources and their importance in interference

Question

In a Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be

Easy

A

0.30 mm
B

0.40 mm
C

0.53 mm
D

450 micron

Solution

$β = \frac{λD}{d}; ∴ B \propto λ \frac{λ^{'}}{λ} = \frac{0 .4}{4 / 3} \Rightarrow λ^{'} = 0 .3 mm$

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