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Physics · 2025 · 1 mark
CBSE 2025 · Region 1 · Set 3 · Q8
A point source is placed at the bottom of a tank containing a transparent liquid (refractive index n ) to a depth H. The area of the surface of the…
A point source is placed at the bottom of a tank containing a transparent liquid (refractive index $\displaystyle n$ ) to a depth H . The area of the surface of the liquid through which light from the source can emerge out is
Official answer
(B)
$\displaystyle \frac{\pi \mathrm{H}^{2}}{\left(n^{2}-1\right)}$
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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.