Physics - Wave Optics Question with Solution | TestHub

The resolving power of a telescope is given by the formula:

$\text{Resolving Power}=\frac{D}{1.22\lambda }$

where $D$ is the diameter of the objective lens and $\lambda$ is the wavelength of the light used.

From the formula, it is clear that the resolving power is directly proportional to the diameter of the objective lens ($D$). Therefore, the resolving power of a telescope can be increased by increasing the diameter of its objective.

Answer: increasing the diameter of objective.