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