Q

A small candle is 18 cm from a concave mirror of focal length 6 cm. What are the image's nature and position?

RRB Group-D 25/08/2026 (12:45 PM - 2:15 PM) 2026
✓ Answer: B Real, 9 cm in front of the mirror
With u = -18 cm and f = -6 cm, 1/v = -1/6 + 1/18 = -1/9. Thus v = -9 cm: a real image in front of the mirror.
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