Q. An object of height $1.5\ cm$ is placed on the axis of a convex lens of focal length $25\ cm$. A real image is formed at a distance of $75\ cm$ from the lens. The size of the image will be
A) $4.5\ cm$
B) $3.0\ cm$
C) $0.75\ cm$
D) $0.5\ cm$
Explanation
(b) $\frac{I}{O} = \frac{f - v}{f} \Rightarrow \frac{I}{+ 1.5} = \frac{(25 - 75)}{25} = - 2 \Rightarrow I = - 3\ cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.