In Cassegrainian telescope, objective lens is………by………… .

In a Cassegrainian telescope, ……………………. is a large concave mirror.

An astronomical telescope has an objective lens of focal length 20 m and eyepiece of focal length 1 cm. Find the angular magnification of the telescope.

In Galileo's telescope , the objective is …..lens but the eyepiece is ……….lens [fill in the blanks] .

A Cassegrainian telescope uses two mirrors as shown in Fig. Such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of large mirror is 220 mm and the small mirror is 40 mm , where will the final image of an object at infinity be ?

In normal adjusment of telescope, final image is……. . And distance between objective lens and eye lens is………. .

Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more. Reason : Objective lens of large objective lens is more. Reason : Objective lens of large diameter collects more light.

a) For the telescope described in Exercise 34 (a), what is the separation between the objective lens and the eyepiece ?