Question

explain the work of newtonian telescope

Answer 1

Newtonians are a type of reflecting telescope. A concave parabolic primary mirror at the back of the telescope collects and focuses incoming light onto a flat secondary (diagonal) mirror that in turn reflects the image out of an opening at the side of the front end of the main tube and into the eyepiece. For large f/ratio Newtonians, the primary mirror often has a spherical shape.

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Answer 2

a reflecting telescope in which the light from the main mirror is deflected by a small flat secondary mirror set at 45°, sending it to a magnifying eyepiece in the side of the telescope.