Q

A photographer uses a concave lens of focal length 12 cm. The object is placed 18 cm from the lens. Using the sign convention, calculate the image distance (v)?

RRB Group D 21 Aug, 2026 (9:00 AM - 10:30 AM) 2026
✓ Answer: C -7.2 cm
Using 1/f = 1/v − 1/u with f = −12 cm and u = −18 cm gives v = −7.2 cm, indicating a virtual image on the object side.
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