Question

To increase the angular magnification of a simple microscope, one should increase
(a) the focal length of the lens
(b) the power of the lens
(c) the aperture of the lens
(d) the object size

Answer 1

Answer:

the focal length of the lens should be increase

Answer 2

To increase the angular magnification of a simple microscope, one should increase the power of the lens.

Option (b) the power of the  lens.

Explanation:

The object is positioned at a distance equal to f (focal length) from the lens for a simple microscope in normal adjustment, and the relation gives angular magnification,

$\begin{equation}\mathrm{m}=\frac{\mathrm{D}}{\mathrm{f}}\end$

$\begin{equation}\text { For } \mathrm{u}<\mathrm{f}, m=\frac{D}{f}+1\end$

$\begin{equation}\text { Lens Power }=\frac{1}{\mathrm{f}}\end$

In order to increase the angular magnification of the microscope, the optical power of the lens should be increased ( or)  the angular magnification is power dependent.

Thus, the option (b) is the correct answer.