Newtonian Telescope
A Newtonian telescope is a type of reflecting telescope invented by Sir Isaac Newton in the 17th century. It consists of a concave primary mirror at the back of the telescope that reflects light to a flat secondary mirror, which then directs the light to the eyepiece. This design allows for a large aperture and a relatively short focal length, resulting in bright, high-resolution images. Newtonian telescopes are popular among amateur astronomers for their simplicity and affordability.