First slide

Coherent sources and their importance in interference

Question

In a Young’s double slit experiment, the slit separation is 0.2 cm, the distance between the screen and slit is 1m. Wavelength of the light used is 5000 Å. The distance between two consecutive dark fringes (in mm) is

Easy

A

0.25
B

0.26
C

0.27
D

0.28

Solution

Distance between two consecutive dark fringes $β = \frac{λD}{d} = \frac{5000 \times 10^{- 10} \times 1}{0 .2 \times 10^{- 2}} = 0 .25 mm$

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