Question

a) Give two reasons to explain why reflecting telescopes are preferred over refracting type.

Answer 1

(a) The reflecting telescopes are preferred over refracting type because of the following reasons:
  (i) There is no chromatic aberration in case of reflecting telescopes as the objective is a mirror.
  (ii) Spherical aberration is reduced in case of reflecting telescopes by using mirror objective in the form of a paraboloid.