Why is reflecting type telescope preferred in astronomy? Explain.

Draw a labelled ray diagram of a reflecting type telescope. Write its any one advantage over refracting type telescope.

A reflecting type telescope has a large spherical mirror for its objective with radus of curvature equal to 80 cm.What is the magnifying power of telescope,if eyepiece used has a focal length of 1.6 cm.

A reflecting type telescope has a concave reflector of radius of curvature 120 cm.Calculate the focal length of eye-piece to secure a magnification of 20.

Explain two advantages of a reflecting telescope over a refracting telescope.

Give three points of difference between refracting type astronomical telescope and reflecting type astronomical telescope.

Why paracetamol is preferred over aspirin?

Why is buffalo milk preferred? Define live stock.