reflector telescope

A reflector telescope or reflecting telescope is a telescope that uses curved reflecting surfaces to magnify the signal rather than lenses (a refracting telescope) or other apparatus. The term is generally used for telescopes with mirrors that observe visible light or ultraviolet or near infrared, but others (such as radio telescopes) also include types that fit the definition, reflecting their radiation analogously. Isaac Newton built an early (visible-light) example, perhaps the first. Various mirror configurations are given "telescope type" names:

• Cassegrain reflector
• coudé focus telescope
• Dall-Kirkham telescope
• Dragone telescope
• Gregorian telescope
• Herschelian telescope
• Korsch telescope
• Nasmyth telescope
• Newtonian telescope
• prime focus
• Ritchey-Chrétien telescope
• Schiefspiegler
• Schmidt camera
• Schmidt-Newton telescope
• three-mirror anastigmat
• Wolter telescope
• Yolo telescope

Other criteria are also used:

• liquid mirror telescope
• segmented mirror
• monolithic mirror
• cylindrical telescope

Examples range from small amateur telescopes to the largest optical telescopes:

• Keck Observatory
• Hale Telescope
• Hubble Space Telescope (HST)
• Extremely Large Telescope (ELT)
• Subaru Telescope
• James Webb Space Telescope (JWST)