Q 12-09-113JEE MainJEE Main 2023 (13 Apr, Shift 2)Easy
A bi-convex lens of focal length $10\ \text{cm}$ is cut in two identical parts along a plane perpendicular to the principal axis. The power of each lens after cut is ______ D.
Numerical value type. Enter your answer.
Answer: 5
Each half is plano-convex with one curved surface, so its focal length doubles to $20\ \text{cm}$.
$P=\dfrac{1}{0.2}=5\ \text{D}$.
Solution by Sreeraj P, M.Sc Physics