First slide

Coherent sources and their importance in interference

Question

Monochromatic green light of wavelength $5 \times 10^{- 7} m$ illuminates a pair of slits 1 mm apart. The separation of bright lines on the interference pattern formed on a screen 2 m away is

Easy

A

0.25 mm
B

0.1 mm
C

1.0 mm
D

0.01 mm

Solution

$β = \frac{λD}{d} = \frac{5 \times 10^{- 7} \times 2}{10^{- 3}} m = 10^{- 3} m = 1 .0 mm$

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