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In a Young’s double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is:

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answer is C.

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Detailed Solution

$600 \times 8 = 400 \times n$ , where n is the number of fringes when wavelength = 400 nm.
$n = 12$

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