Q

A convex lens has radius of curvature 40 cm. What is its power?

RRB Group-D 06/10/2022 / Shift-III 2022
✓ Answer: A +5.0 D
Source key A is retained, including the duplicated option D. The source incorrectly applies f = R/2, a mirror relation. Lens power requires the refractive index and both surface curvatures, so the information is insufficient.
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