Q

An object is 18 cm from a converging lens of focal length 12 cm. Its image is real. What is the magnification?

RRB Group-D 03/08/2026 (12:45 PM - 2:15 PM) 2026
✓ Answer: A -2
For a lens, 1/f = 1/v - 1/u. With f = +12 cm and u = -18 cm, v = +36 cm. Hence m = v/u = -2.
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