Cassegrain Telescope

Q. Which of the following optical instruments are used in a Cassegrain telescope?

1. Concave mirror
2. Convex mirror
3. Concave lens
4. Convex lens

Q.

Differentiate between the principal focus of concave and convex mirrors?

Q. In a Cassegrain telescope, which of the following mirrors is used as the secondary mirror?

1. Plane mirror
2. Convex mirror
3. Concave mirror
4. None of the above

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

1. $\text{Type}:\text{Cassegrain}$
   $\text{X}:\text{Concave mirror}$
2. $\text{Type}:\text{Cassegrain}$
   $\text{X}:\text{Convex mirror}$
3. $\text{Type}:\text{Newtonian}$
   $\text{X}:\text{Eyepiece}$
4. $\text{Type}:\text{Newtonian}$
   $\text{X}:\text{Concave mirror}$

Q.

The concave mirrors are used in

1. reflecting telescopes

2. magic-lanterns

3. cinema projectors

4. all of the above

Q. Concave mirror is a ___ whose reflecting surface is towards the center of the sphere of which the mirror is a part.

1. convex mirror
2. plane mirror
3. spherical mirror
4. concave mirror

Q. Label the parts of the Cassegrain telescope:

1. Eyepiece
2. Concave mirrors
3. Convex mirror
4. Incoming light