A small telescope has a concave mirror with a 4.00-m radius of curvature for its objective. Its eyepiece is a 4.25-cm focal length lens.
(a) What is the telescope's angular magnification?
(b) What is the angle subtended by a 25,000-km diameter sunspot? The average Earth-Sun distance is 1.496 1011 m.
rad
(c) What is the angle of its telescopic image?
rad