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 Aug, 2026 (9:00 AM - 10:30 AM) 2026
✓ Answer: B 1.33
For u = −5 cm and f = −20 cm, the mirror formula gives v ≈ +6.67 cm and m = −v/u ≈ +1.33, an erect magnified image.
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