Q

A dentist uses a concave mirror of focal length 20 cm to examine a patient's tooth. If the tooth is placed 5 cm from the mirror, what is the magnification produced?

RRB Group-D 21/08/2026 (9:00 AM - 10:30 AM) 2026
✓ Answer: B 1.33
With f = -20 cm and u = -5 cm, 1/v = -1/20 + 1/5 = 3/20. Thus v = 20/3 cm and m = -v/u = 4/3 ≈ 1.33. The image is virtual and erect.
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