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In Young's double-slit experiment , we g...

In Young's double-slit experiment , we get 60 fringes in the field of view if we use light of wavelength `4000 Å`. The number of fringes we will get in the same field of view if we use light of wavelength `6000 Å` is

A

60

B

90

C

40

D

`1.5`

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The correct Answer is:
C
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