A telescope has an objective lens of 0.1 m diameter and is situated at a distance of 500 m from two objects. What will be the minimum distance between these two objects which can be resolved by the telescope. The mean wavelength of light is 600 nm.

3.66 mm

Resolving Power = $ \frac{d}{D} = \frac{1.22 \lambda}{a}$

$ d = \frac{1.22 \lambda D}{a} = \frac{1.22 \times 600\times 10^{-9} \times 500}{0.1} = 3.66mm$