Q

A student places an object 18 cm from a converging lens of focal length 12 cm. The image formed is real. What is the magnification produced by the lens?

RRB Group D 03 Aug, 2026 (12:45 PM - 2:15 PM) 2026
✓ Answer: A - 2
Using the lens formula with u = −18 cm and f = +12 cm gives v = +36 cm. Hence m = v/u = −2, so the image is inverted and twice the size.
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