Q. A lens (focal length $50\ cm$) forms the image of a distant object which subtends an angle of $1\ milliradian$ at the lens. What is the size of the image
A) $5\ mm$
B) $1\ mm$
C) $0.5\ mm$
D) $0.1\ mm$
Explanation
(c) Size of image $= f\theta = 0.5 \times \left( 1 \times 10^{- 3} \right) = 0.5\ mm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.