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Question

In Young's double-slit experiment, 30 fringes are obtained in the field of view of the observing telescope, when the wavelength of light used is 4000˚A. If we use monochromatic light of wavelength 6000˚A, the number of fringes obtained in the same field of view is:

A
30
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B
45
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C
20
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D
none of these
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Solution

The correct option is C 20
Wavelength of light used is inversely proportional to number of fringes observed.
λ1n1=λ2n2

n2=λ1n1λ2=4000×306000=20

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