A convex lens of focal length is required to give an erect image twice the size of…

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

A convex lens of focal length 12 cm12\,\text{cm} is required to give an erect image twice the size of the object. At what distance from the lens should the object be placed (use sign convention)? (a) u=+6 cmu = +6\,\text{cm} (b) u=−6 cmu = -6\,\text{cm} (c) u=−18 cmu = -18\,\text{cm} (d) u=−12 cmu = -12\,\text{cm}

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