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MHT CET 2026 (14 May, Shift 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2026 (14 May, Shift 1)

Q4MHT CET 2026 · 14 MAY · SHIFT 1Easy

YDSE: Fringe Width & Fringe Positions

If fringe width is $0.4$ mm, the distance between fifth bright and third dark band on the same side in interference pattern of Young's double slit experiment is (in mm)

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Answer: (a)

$n$ th bright: $y = n\beta$ ; $n$ th dark: $y = (n - \frac{1}{2})\beta$
5th bright $= 5\beta$ , 3rd dark $= 2.5\beta$
Distance $= 2.5\beta = 2.5\times0.4 = 1$ mm, so the answer is (a).

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