A homemade telephoto lens (Fig. P.5.86) consists of two spherical mirrors. The radius of curvature is 2.0

Question:

A homemade telephoto €œlens€ (Fig. P.5.86) consists of two spherical mirrors. The radius of curvature is 2.0 m for the primary (the big mirror) and 60 cm for the secondary (the small mirror). How far from the smaller mirror should the film plane be located if the object is a star? What is the effective focal length of the system?

Figure P.5.86 3