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Question

In young's double-slit experiment, we get 60 fringes in the field of view of monochromatic light of wavelength 4000 ˚A. If we use monochromatic light of wavelength 6000 ˚A, then the number of fringes obtained in the same field of view are

A
60
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B
90
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C
40
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D
15
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Solution

The correct option is C 40
Given,
n1=60λ1=4000 ˚A ;λ2=6000 ˚A

Using
n1λ1=n2λ2

60×4000=n2×6000

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (C) is the correct answer.
n2=40

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