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NEET 2022 (Phase 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from NEET 2022 (Phase 1)

Q42NEET 2022 · PHASE 1Easy

YDSE: Fringe Width & Fringe Positions

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: (d)

Same region: $n_1\lambda_1 = n_2\lambda_2$
$n_2 = \frac{8 \times 600}{400} = 12$
So the answer is (d) 12.

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