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 $Å$ If we use monochromatic light of wavelength 6000 $Å$ then the number of hinges obtained in the same field of view is

Moderate

A

60
B

90
C

40
D

1.5

Solution

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

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