First slide

Resolving power of optical instruments

Question

When diameter of the aperture of the objective of an astronomical telescope is increased, its

Moderate

A

Magnifying power is increased and resolving power is decreased
B

Magnifying power and resolving power both are increased
C

Magnifying power remains the same but resolving power is increased
D

Magnifying power and resolving power both are decreased

Solution

$RP = \frac{D}{1.22 λ} m = - \frac{f_{0}}{f_{e}} (1 + \frac{f_{e}}{D})$
D is diameter of the aperture in RP.
D is the least distance of distinct vision in m.

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