A reflecting telescope is an optical instrument that uses mirrors to gather and focus light. Unlike refracting telescopes, which use lenses, reflecting telescopes utilize a curved primary mirror to collect light and reflect it to a focal point. This design allows for larger apertures, making it possible to observe faint celestial objects. The first successful reflecting telescope was invented by Isaac Newton in the late 17th century. Today, many modern telescopes, including large observatories, use this design due to its ability to produce clear images without chromatic aberration, a common issue in refracting telescopes.