Telescopes Are Those That Use Both Mirrors And Lenses

Catadioptric: Catadioptric telescopes are those that use both mirrors and lenses to produce an image. The most common or popular type of catadioptric telescope is the Schmidt-Cassegrain telescope. Schmidt-Cassegrain telescopes (SCT) are a catadioptric design, meaning they use both lenses and mirrors. SCTs are primarily reflecting telescopes, but they use a corrector lens to eliminate aberrations that would result from the mirror design alone. In an SCT the incoming light passes through the Schmidt corrector lens (also called a corrector plate) at the front of telescope. It is reflected from a concave primary mirror at the back of the scope which focuses the light to the front of the telescope where it is reflected again by a smaller, convex secondary mirror. Finally, the light travels back through a hole in the primary mirror to the rear of the scope where an eyepiece is located for visual observing. (Starizona.com, 2015) Below is a ray diagram of a Schmidt-Cassegrain telescope: (A-levelphysicstutor.com, 2015) At first it seems that an SCT should have a focal length twice as long as the length of the tube, since the light travels twice the length of the tube. However, SCTs actually have focal lengths about 5 times longer than the tube length. This is due to the convex curvature of the secondary mirror. This effectively magnifies the focal length, making the scope act much longer than it is. The diagram below shows how a Cassegrain type telescope (such as an SCT)Show MoreRelatedHistory of the Telescope2127 Words   |  9 PagesIntroduction The telescope is an instrument which increases our ability to observe far away objects through the collection of electromagnetic radiation, the most prevalent type of telescope is the optical telescope which collects light, however there are other kinds of telescopes which collect UV and X -Rays. 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