Question:medium

A double convex lens made of glass of refractive index $1.5$ and radii of curvature $20\,\text{cm}$ each is immersed in a liquid of refractive index $n_L$. The correct plot showing the variation of the power, in the units of diopter $(D)$, as a function of $n_L$, is:

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Power of a lens in a medium: \[ P= \left(\frac{n_g}{n_m}-1\right) \left(\frac1{R_1}-\frac1{R_2}\right) \] If surrounding medium has larger refractive index than the lens, the lens may behave like a concave lens.

Updated On: May 22, 2026

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The Correct Option is C

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A double convex lens made of glass of refractive index \(1.5\) and radii of curvature \(20\,\text{cm}\) each is immersed in a liquid of refractive index \(n_L\). The correct plot showing the variation of the power, in the units of diopter \((D)\), as a function of \(n_L\), is:

Show Hint

The Correct Option is C

Solution and Explanation

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