Question

What happens to the magnifying power of a microscope, when its length increases?

Answer 1

Microscope:

1. An optical tool that magnifies an object by using a lens or a combination of lenses is called a microscope.
2. Mathematically, magnification $\left(\mathrm{m}\right)$ in the microscope is given as follows:

$\mathrm{m}=-\frac{\mathrm{L}}{{\mathrm{f}}_0}\times \frac{\mathrm{D}}{{\mathrm{f}}_{\mathrm{e}}}$

Where, $\mathrm{L}$ is the length of the tube, $\mathrm{D}$is the least distance for clear vision, ${\mathrm{f}}_0$ is the focal length of the objective, and, ${\mathrm{f}}_{\mathrm{e}}$is the focal length of the eyepiece.
So, as $\mathrm{L}$ increases, $\mathrm{m}$ also increases.

Therefore, when the length of the microscope increases, its magnifying power increases.