Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content The classic Cassegrain telescope has a parabolic primary mirror and a hyperbolic secondary mirror Source Wikipedia Copyright information Text from Wikipedia and Wiktionary web pages quoted for educational purposes is subject to the Wikipedia Creative Commons Attribution ShareAlike Licence Snippet kind INFO Keywords reflecting telescope reflector optical telescope telescope Ritchey–Chrétien telescope coma spherical abberation focal plane mirror curvature primary mirror secondary mirror mirror Previous snippet Full quote It is free of coma and spherical aberration at a nearly flat focal plane if the primary and secondary curvature are properly figured. URL https://en.wikipedia.org/wiki/Reflecting_telescope Next snippet Related snippets A curved primary mirror is the reflector telescope's basic optical element that creates an image at the focal plane [OF THE PRIMARY IF THERE IS NO SECONDARY]. The distance from the mirror to the focal plane is called the focal length. The Gregorian telescope ... employs a concave secondary mirror that reflects the image back through a hole in the primary mirror. This produces an upright image The Newtonian telescope ... usually has a paraboloid primary mirror but at focal ratios of f/8 or longer a spherical primary mirror can be sufficient for high visual resolution. The cassegrain telescope (sometimes called the "Classic Cassegrain") ... has a parabolic primary mirror, and a hyperbolic secondary mirror that reflects the light back down through a hole in the primary. The Ritchey–Chrétien telescope ... is a specialized Cassegrain reflector which has two hyperbolic mirrors (instead of a parabolic primary). Related snippets (backlinks) Visit also Visit also (backlinks) Flags
