A reflector telescope is an optical instrument that uses mirrors to gather and focus light from distant objects, such as stars and galaxies. The primary mirror, usually curved, collects light and reflects it to a focal point, where an eyepiece or camera can be placed to view or capture images. This design allows for larger apertures, making it possible to observe faint celestial objects. Invented by Isaac Newton in the 17th century, the reflector telescope has become a popular choice among astronomers. Its ability to minimize chromatic aberration, a common issue in refractor telescopes that use lenses, makes it particularly effective for deep-sky observations.