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Physics-

General

Easy

Question

In Young's double slit experiment, 12 fringes are obtained to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by

18
24
30
36

The correct answer is: 18

$n subscript 1 end subscript lambda subscript 1 end subscript equals n subscript 2 end subscript lambda subscript 2 end subscript$
$therefore n subscript 2 end subscript equals fraction numerator n subscript 1 end subscript lambda subscript 1 end subscript over denominator lambda subscript 2 end subscript end fraction equals fraction numerator 12 x 600 over denominator 400 end fraction equals 18$

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parallel

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