There is a telescope whose objective has a diameter D = 5.0 cm. Find the resolving power of the objective and the minimum separation between two points at a distance l = 3.0 km from the telescope, which it can resolve (assume λ = 0.55 μm).
Resolving power of the objective
Let (Δy)mn be the minimum distance between two points at a distance of 3.0 km which the telescope can resolve. Then
