First slide

Coherent sources and their importance in interference

Question

Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits

Easy

A

0.12 mm
B

0.3 mm
C

3.0 mm
D

4.0 mm

Solution

$β = \frac{λD}{d} = \frac{6000 \times 10^{- 10} \times 2}{4 \times 10^{- 3}} = 3 \times 10^{4} m = 0 .3 mm$

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