Question

In a simple microscope, if the final image is located at $25\, cm$ from the eye placed close to the lens, then the magnifying power is

• A. $\frac{25}{f}$
• B. $1+\frac{25}{f}$
• C. $\frac{f}{25}$
• D. $\frac{f}{25}+1$

Answer 1

Answer: (B)

$1+\frac{25}{f}$

Answer 2

Magnification of a simple microscope is given by
$m=1+\frac{D}{f}$
where $D$ is distance of final image.
Given, $D=25\, cm$
$\therefore m=1+\frac{25}{f}$