Question

Which of the following is true about the following telescope and the part labelled?

• A. $\text{Type}:\text{Cassegrain}$
  $\text{X}:\text{Concave mirror}$
• B. $\text{Type}:\text{Cassegrain}$
  $\text{X}:\text{Convex mirror}$
• C. $\text{Type}:\text{Newtonian}$
  $\text{X}:\text{Eyepiece}$
• D. $\text{Type}:\text{Newtonian}$
  $\text{X}:\text{Concave mirror}$

Answer 1

The correct option is A $\text{Type}:\text{Cassegrain}$

$\text{X}:\text{Concave mirror}$
The Cassegrain telescope uses a concave mirror. The light rays after reflection from the concave mirror are reflected back towards it by a small convex mirror. They pass through a hole at the centre of the concave mirror and then through the eyepiece situated at the back of the mirror. The eyepiece gives a magnified image of the source.