The first practical reflector design telescopes were introduced in which year, and by which inventor?

The first practical reflector telescope was designed and constructed by Isaac Newton in 1668. This design marked a significant advancement in telescope technology. Unlike earlier telescopes, which primarily used lenses (refractors), Newton's reflector utilized a curved mirror to gather and focus light. This innovation allowed for a clearer image and reduced chromatic aberration, which was a common problem in lens-based telescopes of the time.

The choice reflecting the correct year and inventor highlights Newton's pioneering work, which fundamentally changed the way astronomical observations were conducted. His design paved the way for future developments in telescope technology, influencing both observational astronomy and our understanding of celestial mechanics.