Checkout JEE MAINS 2022 Question Paper Analysis : Checkout JEE MAINS 2022 Question Paper Analysis :

In Young’s double-slit experiment, the distance between two sources is 0.1 mm. The distance of the screen from the sources is 20 cm. The wavelength of light used is 5460 Å Then the angular position of the first dark fringe is A.

a) 0.08o

b) 0.16o

c) 0.20o

d) 0.32o

Answer: b) 0.16o

Solution:

Δx = dsinθ = λ/2

sinθ = λ/2d

θ = sin-1(λ/2d)

= sin-1[(5460 x 10-10)/(2 x 0.1 x 10-3)]

= 0.16o

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