Q. Which of the following is a wrong statement?
A) $D = 1/f$where, $f$is the focal length and $D$ is called the refractive power of a lens
B) Power is expressed in a diopter when $f$is in metre
C) Power is expressed in diopter and does not depend on the system of unit used to measure $f$
D) $D$ is positive for convergent lens and negative for divergent lens
Explanation
The correct answer is Option C: Power is expressed in diopter and does not depend on the system of unit used to measure $f$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.