First slide

Coherent sources and their importance in interference

Question

Young’s double slit experiment is performed with light of wavelength 550 nm. The separation between the slits is 1.10 mm and screen is placed at distance of 1 m. What is the distance between the consecutive bright or dark fringes

Easy

A

1.5 mm
B

1.0 mm
C

0.5 mm
D

None of these

Solution

Distance between consecutive bright fringes or dark fringes = $β$
$β = \frac{λD}{d} = \frac{550 \times 10^{- 9} \times 1}{1 .1 \times 10^{- 3}} = 500 \times 60^{- 6} = 0 .5 mm$

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