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Physics · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 3 · Q18
In a Young's double-slit experiment, the intensity at the central maximum in the interference pattern on the screen is I_0. Find the intensity at a…
In a Young's double-slit experiment, the intensity at the central maximum in the interference pattern on the screen is $\displaystyle \mathrm{I}_{0}$. Find the intensity at a point on the screen where the path difference between the interfering waves is $\displaystyle \frac{\lambda}{6}$.
Marking-scheme solution
\[\begin{aligned}
\mathrm{I}_{0} & =\mathrm{I}_{1}+\mathrm{I}_{2}+2 \sqrt{\mathrm{I}_{1}} \sqrt{\mathrm{I}_{2}} \cos \phi \\
& =\mathrm{I}+\mathrm{I}+2 \mathrm{I} \cos 0^{0}
\end{aligned}
\]
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.