Telescope and its properties | telescope nearby adjustments

Telescopic sum and its properties

Refracting Telescope

If f_o and f_e are the focal lengths of the objective lens and eye-piece lens respectively for a telescope, the length of telescope in normal adjustment is

The focal lengths of the eyepiece and the objective of an astronimical telescope are 2 cm and 100 cm respectively. The magnifying power of the telescope for normal adjustment and the length of the telescope is

The focal length of the objective and eyepiece of an astronomical telescope for normal adjustments are 50 cm and 5 cm. The length of the telescope should be:

What is the distance between objective and eye lens of telescope in normal adjustment ?

Terrestrial Telescope

Reflecting Telescope

The magnifytion power of the astronomical telescope for normal adjustment is 50cm. The focal length of the eyepiece is 2cm. The required length of the telescope for normal adjustment is