Question

Which of the following is wrong statement ?

• A. $D=\frac{1}{f}$ where$f$ is focal length and $D$ is optical power of lens.
• B. Power is in diopter when $f$ is in meters.
• C. Power is in diopter and does not depend upon the system of unit used to measure $f$.
• D. $D$ is positive for convergent lens and $D$ is negative for divergent lens.

Answer 1

Answer: (C)

Power is in diopter and does not depend upon the system of unit used to measure $f$.

$D=\frac{1}{f}$ where $f$ is in meter

So option C is wrong

C) power is in diopter and does not depend upon the system of unit used to measure