Physics · 2025
JEE Main · 28 January 2025, Shift 1 · Q41
A hemispherical vessel is completely filled with a liquid of refractive index μ. A small coin is kept at the lowest point (O) of the vessel as shown…
A hemispherical vessel is completely filled with a liquid of refractive index $\displaystyle \mu$. A small coin is kept at the lowest point (O) of the vessel as shown in figure. The minimum value of the refractive index of the liquid so that a person can see the coin from point E (at the level of the vessel) is
$\displaystyle \_\_\_\_$.
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle \sqrt{2}$
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JEE Main 2025 Physics question, with the answer from NTA’s final answer key. Where our answers come from.