First slide

Young's double slit Experiment

Question

Two parallel slits 0.6 mm apart are illuminated by light source of wavelength $6000 Å.$ The distance between two consecutive dark fringes on a screen 1 m away from the slits is

Easy

A

1 mm
B

0.01 mm
C

0.1 m
D

10 m

Solution

Distance between two consecutive dark fringes $\frac{λD}{d} = \frac{6000 \times 10^{- 10} \times 1}{0 .6 \times 10^{- 3}}$
$= 1 \times 10^{- 3} m = 1 mm$

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