Q. A dentist has a small mirror of focal length 16 mm. He views the cavity in the tooth of a patient by holding the mirror at a distance of 8 mm from the cavity. The magnification is
A) 1
B) 1.5
C) 2
D) 3
Explanation
(c) $m = \frac{f}{f - u} = \frac{- 16}{- 16 - ( - 8)} = \frac{- 16}{- 8} = 2$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.