Two lenses, separated by a distance of 21.0 cm, are used in combination. The first lens has a focal length of + 30.0 cm; the second has a focal length of − 15.0 cm. An object, 2.0 mm long, is placed 1.8 cm before the first lens.
(a) What are the intermediate and final image distances relative to the corresponding lenses?
(b) What is the total magnification?
(c) What is the height of the final image?