Write the equation of magnification for a simple microscope when the image is formed at the near point.

(N/A) For a simple microscope,the magnification $m$ is defined as the ratio of the angle subtended by the image at the eye to the angle subtended by the object at the eye when placed at the near point.
When the image is formed at the near point $(D)$,the magnification is given by:
$m = 1 + \frac{D}{f}$
where $D$ is the least distance of distinct vision (near point,typically $25 \ cm$) and $f$ is the focal length of the convex lens.