In an astronomical telescope, the distance between……….and…….can be varied.

In an astronomical telescope, the distance between the objective lens and eyepiece is 20 cm. In normal adjustment, the magnifying power of the telescope is 15. Find the focal length of the objectives lens.

In an astronomical telescope the distance between the eye-piece and the objective is

In an astronomical telescope of refracting type:

An astronomical telescope has large apeture to

An astronomical telescope has large apeture to