Physics · 2026
JEE Main · 22 January 2026, Shift 1 · Q50
A parallel beam of light travelling in air (refractive index 1.0 ) is incident on a convex spherical glass surface of radius of curvature 50 cm.…
A parallel beam of light travelling in air (refractive index $\displaystyle 1.0$ ) is incident on a convex spherical glass surface of radius of curvature $\displaystyle 50$ cm . Refractive index of glass is $\displaystyle 1.5$ . The rays converge to a point at a distance $\displaystyle x \mathrm{~cm}$ from the centre of the curvature of the spherical surface. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$ cm.
Official answer
From NTA’s final answer key for this paper.
100
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.