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Physics · 2026 · 1 mark
CBSE 2026 · Region 5 · Set 1 · Q14
Assertion (A): In Young's double-slit experiment, the fringe width for dark and bright fringes is the same. Reason (R): Fringe width is given by β=(λ…
Assertion (A) : In Young's double-slit experiment, the fringe width for dark and bright fringes is the same.
Reason (R) : Fringe width is given by $\displaystyle \beta=\frac{\lambda \mathrm{D}}{\mathrm{d}}$, where symbols have their usual meanings.
Official answer
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.