Reflector telescopes use mirrors to gather and focus light, allowing astronomers to observe distant celestial objects. The primary mirror, usually curved, reflects light to a focal point where an eyepiece or camera can capture the image. This design minimizes chromatic aberration, a common issue in refractor telescopes that use lenses. Invented by Isaac Newton in the 17th century, reflector telescopes have become popular for both amateur and professional astronomy. They come in various sizes and designs, including the Newtonian and Cassegrain types, making them versatile tools for exploring the universe.