Geometrical Optics

A simple telescope, consisting of an objective of focal length \(60 \mathrm{~cm}\) and a single eye lens of focal length \(5 \mathrm{~cm}\) is focused on a distant object in such a way that parallel rays emerge from the eye lens. If the object subtends an angle of \(2^{\circ}\) at the objective, the angular width of the image is