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Q.

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

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a

60

b

90

c

40

d

1.5

answer is C.

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Detailed Solution

we know that n1λ1=n2λ2n2=n1λ1/λ2=60×(4000/6000)=40
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