Chapter 24, Problem 72GP

* Resolving sunspots You are looking at sunspots. They usually appear in pairs on the surface of the Sun. The Sun is about $1.5\times {10}^{11}$ m from Earth. How close can two sunspots be so you can distinguish them when you observe them though an amateur telescope whose aperture (objective lens) is about 20 cm? Describe all of the assumptions that you made.