Question

A magnifying lens is of focal length $10cm$. If $Dcm$ is the distance from the lens, where an object should be placed to view the object at maximum magnification, then find the value of $\left(\frac{14}{50}D\right)$

Answer 1

For maximum magnification, the image should be formed at least distance of clear vision.

$v=25cm$
$\therefore \frac{1}{(-25)}-\frac{1}{u}=\frac{1}{10}$
$\Rightarrow u=-\frac{50}{7}cm$