Physics · 2026
JEE Main · 28 January 2026, Shift 1 · Q43
The magnitudes of power of a biconvex lens (refractive index 1.5) and that of a plano-concave lens (refractive index =1.7 ) are same. If the…
The magnitudes of power of a biconvex lens (refractive index $\displaystyle 1.5$) and that of a plano-concave lens (refractive index $\displaystyle =1.7$ ) are same. If the curvature of planoconcave lens exactly matches with the curvature of back surface of the biconvex lens, then ratio of radius of curvature of front and back surface of the biconvex lens is $\displaystyle \_\_\_\_$.
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle 5$ : $\displaystyle 2$
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.