Discussion:
Q1. Why are radio telescopes larger than optical telescopes?
Q2. Why do optical astronomers put their telescopes on the tops of high mountains, while radio astronomers put their telescopes in deep valleys.
Q3. a)What is the purpose of the telescopic eyepiece ?
b) What aspect of the eyepiece determines the magnification of the telescope?
c) In what circumstances would the eyepiece not be used ?