Question

explain the work of the newtonian telescope

Answer 1

instead of using a lens together light Newton uses a curved metal mirror. mirror does not have a chromatic aberration problems that lens do. Newton placed the primary mirror in the back of the tube .

Answer 2

instead of using a lens to gather light, Newton used a curved, metal mirror (primary mirror) to collect the light and reflect it to a focus. Mirrors do not have the chromatic aberration problems that lenses do. Newton placed the primary mirror in the back of the tube.