Q

A convex lens forms a virtual image 15 cm on the same side as the object when the object is placed 10 cm from the lens. What is the focal length of the lens?

RRB Group D 18 Aug, 2026 (12:45 PM - 2:15 PM) 2026
✓ Answer: B + 30 cm
With u = −10 cm and v = −15 cm, the lens formula gives f = +30 cm, as expected for a converging lens.
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