Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content A curved primary mirror is the reflector telescope's basic optical element 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 primary mirror mirror focal plane focal length Previous snippet Full quote A curved primary mirror is the reflector telescope's basic optical element that creates an image at the focal plane [OF THE PRIMARY]. The distance from the mirror to the focal plane is called the focal length [OF THE PRIMARY]. URL https://en.wikipedia.org/wiki/Reflecting_telescope#Technical_considerations Next snippet Related snippets Related snippets (backlinks) Film or a digital sensor may be located here to record the image, or a secondary mirror may be added to modify the optical characteristics and/or redirect the light to film, digital sensors, or an eyepiece for visual observation. 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 There are several large modern telescopes that use a Gregorian configuration such as the Vatican Advanced Technology Telescope, the Magellan telescopes, the Large Binocular Telescope, and the Giant Magellan Telescope. 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. A flat secondary mirror reflects the light to a focal plane at the side of the top of the telescope tube. 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). It is free of coma and spherical aberration at a nearly flat focal plane if the primary and secondary curvature are properly figured. A segmented mirror is an array of smaller mirrors designed to act as segments of a single large curved mirror. ... They are used as objectives for large reflecting telescopes. The Gregorian telescope consists of two concave mirrors; the primary mirror (a concave paraboloid) collects the light and brings it to a focus before the secondary mirror (a concave ellipsoid) where it is reflected back through a hole in the centre ... In a prime focus design no secondary optics are used, the image is accessed at the focal point of the primary mirror. Visit also Visit also (backlinks) Flags
