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Question

In Young's double slit experiment, we get 10 fringes in the field of view of monochromatic light of wavelength 4000 oA. If we use monochromatic light of wavelength 5000 oA, then the number of fringes obtained in the same field of view is

A
8
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B
10
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C
40
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D
50
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Solution

The correct option is A 8
As βλ
fringe width becomes 54 times,
No, of fringes = 45×10=8

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