Question

In a Young’s double slit experiment, the screen is separated from double-slit by 1.2 m. The distance between the two slits is 0.030 mm. Calculate the distance between adjacent bright fringes. (Given, the wavelength of the light used is λ=560 nm).​

Answer 1

Explanation:

Given : D=1 m, λ=650×10

−9

m, d=1 mm=10

−3

m

Distance of third dark fringe from centre of pattern

x

1

=(3−

2

1

)

d

Dλ

=

2

5

×

1×10

−3

1×650×10

−9

=1.62mm

Distance of fifth bright fringe from centre of pattern

x

2

=5

d

Dλ

=3.24mm

∴ Required distance Δx=x

2

−x

1

Δx=3.24−1.62=1.62mm