Q. A convex lens has a focal length $f$. If is cut into two parts along the dotted line as shown in the figure. The focal length of each part will be
A) $\frac{f}{2}$
B) $f$
C) $\frac{3}{2}f$
D) $2f$
Explanation
(d) $f = \frac{R}{2(\mu - 1)},\ f^{'} = \frac{R}{(\mu - 1)} \Rightarrow f^{'} = 2f$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.