Question

3. What are the difficulties in using
ground based optical telescopes?
How are they overcome?
4. Which type of telescopes can be made
using a concave mirror, convex
mirror, plane mirror and a lens?
Draw diagrams of these telescopes.
21​

Answer 1

Explanation:

3.The difficulties in using ground based optical telescopes is that environment which preserves life on Earth also intervenes with a telescope's image quality. The components and particles in the Earth's environment curve the light so that pictures discovered from observatory telescopes seems to be blurred.

4.In a reflecting telescope, instead of a convex objective lens, a concave mirror is used to collect parallel rays from the object and form an image at the focal point.