Choose the correct formula for magnifying power of a simple microscope from the following.

$m=1-\frac{d}{f}$ $m=1+\frac{d}{f}$ $m=1-\frac{f}{d}$ $m=1+\frac{f}{d}$

$m=1+\frac{d}{f}$

The correct answer is Option (2) → $m=1+\frac{d}{f}$