First slide

Young's double slit Experiment

Question

In Young's double slit experiment, we get 60 fringes in the field of view of monochromatic light of wavelength 4000 A. If we use monochromatic light of wavelength 6000 A, then the number of fringes obtained in the same field of view is

Easy

A

60
B

90
C

40
D

1.5

Solution

$n_{1} λ_{1} = n_{2} λ_{2} or n_{2} = n_{1} (λ_{1} / λ_{2}) n_{2} = 60 \times (4000 / 6000) = 40$

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