Physics · 2026
JEE Main · 2 April 2026, Shift 2 · Q41
One side of an equilateral prism is painted by a transparent material of refractive index n_2. The refractive index of prism is 1.6. The minimum…
One side of an equilateral prism is painted by a transparent material of refractive index $\displaystyle n_2$. The refractive index of prism is $\displaystyle 1.6$ . The minimum value of $\displaystyle n_2$ required for total internal reflection from painted face is $\displaystyle \_\_\_\_$.
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle 4 \sqrt{3} / 5$
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.