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MHT CET 2025 (20 Apr, Shift 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2025 (20 Apr, Shift 1)

Q14MHT CET 2025 · 20 APR · SHIFT 1Easy

YDSE: Fringe Width & Fringe Positions

In Young's double slit experiment, when light of wavelength 600 nm is used, 18 fringes are observed on the screen. If the wavelength of light is changed to 400 nm, the number of fringes observed on the screen is

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Answer: (b)

Same region: $n_1\lambda_1 = n_2\lambda_2$
$n_2 = \frac{18 \times 600}{400} = 27$
So the answer is (b) 27.

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