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MHT CET 2026 (18 Apr, Shift 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2026 (18 Apr, Shift 1)

Q7MHT CET 2026 · 18 APR · SHIFT 1Easy

YDSE: Fringe Width & Fringe Positions

In a certain region of the screen, number of fringes formed is observed to be 8 in Young's double slit experiment when light of wavelength $6600$ Å is used. If the light of wavelength $4400$ Å is used, the number of fringes observed in the same region of the screen will be

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Answer: (b)

In a fixed region, length $= n\beta \propto n\lambda$ , so $n_1\lambda_1 = n_2\lambda_2$
$n_2 = \frac{8 \times 6600}{4400} = 12$
So the answer is (b) $12$ .

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