Which telescope technology did Sir Isaac Newton contribute to that uses mirrors instead of lenses?

Sir Isaac Newton significantly advanced telescope technology by developing the reflecting telescope, which utilizes mirrors to gather and focus light instead of lenses, as seen in refracting telescopes. This innovation allowed for larger aperture sizes and eliminated issues like chromatic aberration, which occurs with lenses. Newton's design involved placing a curved mirror at the back of the telescope's tube, which reflects light to a focal point, where a smaller flat mirror redirects the light to the eyepiece. This method was groundbreaking as it permitted the construction of telescopes that could observe fainter celestial objects more effectively. Such advancements laid the groundwork for modern astronomical observation, fundamentally changing how humans study the universe.