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It is a telescope with a concave mirror and crop mirror. It can be divided into several types such as Newtonian telescope and Cassegrain telescope. But in order to reduce the influence of other aberrations, the available field of view is smaller. The material for manufacturing the reflector only requires a small expansion coefficient, low stress and easy grinding. The polished reflector is generally coated with a layer of aluminum film on the surface. The reflectance of the aluminum film in the range of 2000-9000 angstroms is greater than 80%. Therefore, in addition to the optical band, the reflecting telescope is also suitable for the near-infrared and near-ultraviolet bands. Research. The relative aperture of the reflecting telescope can be made larger, the relative aperture of the main focus reflecting telescope is about 1/5-1/2.5, or even larger, and except for the Newtonian telescope, the length of the lens barrel is shorter than the focal length of the system. In addition, the main mirror has only one surface to be processed, which greatly reduces the cost and manufacturing difficulties. Therefore, optical telescopes with an aperture greater than 1.34 meters are all reflecting telescopes. A reflecting telescope with a larger aperture can obtain the main focus system (or Newton system), Cassegrain system and folding axis system by changing different secondary mirrors. In this way, a telescope can obtain several different relative apertures and fields of view. Reflecting telescopes are mainly used for astrophysics work.
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We (Alice) are a manufacturer specializing in the production of optical signs, focusing on providing supporting services for the furniture industry, machinery industry, electronic and electrical industry and other industries, mainly producing zinc alloy, aluminum, stainless steel, copper, brass, pvc Wait for different labels.
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Alice has dedicated to precise product since it was established in 1998, especially focus on furniture and electronic appliances field as a tendency.
