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

(1) 9  

(2) 12

(3) 6

(4) 8

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(2) 12

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