Question

How can the resolving power of a telescope be increased?

Answer 1

Resolving power of telescope is defined as the reciprocal of the smallest angular separation between two distant objects whose images are seen separately.

Resolving power of telescope RP$=\frac{a}{1.22\lambda }$

where $a$ is the diameter of objective lens of telescope.

$⟹$ RP $\propto a$

Thus resolving power of telescope can be increased by increasing the diameter of objective lens of telescope.