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MHT CET 2026 (12 May, Shift 1) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2026 (12 May, Shift 1)

Q3MHT CET 2026 · 12 MAY · SHIFT 1Easy

YDSE: Fringe Width & Fringe Positions

In Young's double slit experiment, the fringe width is $2.4$ mm with light of wavelength $9000$ A.U. If the light of wavelength $5400$ A.U. is used, with no other change in the experimental set up. The change in fringe width is

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Answer: (b)

$\beta \propto \lambda$ : $\beta' = 2.4\times\frac{5400}{9000} = 1.44$ mm
Change $= 2.4 - 1.44 = 0.96$ mm, so the answer is (b).

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