Define the term 'resolving power' of an astronomical telescope. H… - Vidyadip

Question

Define the term 'resolving power' of an astronomical telescope. How does it get affected on?

Increasing the aperture of the objective lens?
Increasing the wavelength of the light used?

Justify your answer in each case.

✓

Answer

Resolving power (R.P) is the reciprocal of limit of angular resolution OR any other suitable definition.

Increases:

Resolving power $ = \frac{\text{d}}{1.22\lambda}$

$\therefore$ R.P is directly proportional to ‘d’ (For a given $\lambda$)

Decreases:

$\therefore$ R.P is inversely proportional to $'\lambda'$ (For a given d).

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