Q. A lens of focal power $0.5\ D$ is
A) A convex lens of focal length $0.5\ m$
B) A concave lens of focal length $0.5\ m$
C) A convex lens of focal length $2\ m$
D) A concave lens of focal length $2\ m$
Explanation
(c) $P = \frac{1}{f} \Rightarrow f = \frac{1}{0.5} = 2m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.