First slide

Coherent sources and their importance in interference

Question

In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is

Easy

A

1.0 mm
B

0.1 mm
C

0.05 mm
D

0.01 mm

Solution

$d = \frac{Dλ}{β} = \frac{1 \times 5 \times 10^{- 7}}{5 \times 10^{- 3}} = 10^{- 4} m = 0 .1 mm$

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