Question:medium

The magnitudes of power of a biconvex lens (refractive index \(1.5\)) and that of a plano-convex lens (refractive index \(1.7\)) are same. If the curvature of the plano-convex lens exactly matches with the curvature of the back surface of the biconvex lens, then the ratio of radii of curvature of the front and back surfaces of the biconvex lens is:

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In lens problems, always apply the lens-maker formula carefully and watch the sign convention for radii.

Updated On: Apr 2, 2026

\(5:2\)
\(5:12\)
\(12:5\)
\(2:5\)

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The Correct Option is D

Solution and Explanation

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Questions Asked in JEE Main exam

Six point charges are kept \(60^\circ\) apart from each other on the circumference of a circle of radius \( R \) as shown in figure. The net electric field at the center of the circle is ___________. (\( \varepsilon_0 \) is permittivity of free space)