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A telescope with a mirror crop mirror. An important feature of the optical performance of reflecting telescopes is that there is no chromatic aberration. Although other aberrations can be eliminated in theory, the process is complicated. In order to avoid aberrations, practical reflecting telescopes generally have a relatively small field of view, and the field of view can be expanded through an image field correction lens. The material of the reflector requires small expansion coefficient, low stress and easy grinding. The mirror surface is usually aluminum-plated, and good reflectivity can be obtained in the infrared and ultraviolet regions. The mirror tube of a reflecting telescope is generally relatively short for easy support. Modern high-tech reflecting telescopes also have a mirror adaptive optics system and an active optics system, which can compensate for atmospheric disturbances and distortion caused by mirror stress and wind.
The largest optical telescope in China is 2.16 meters. At present, the largest telescope in the world is the Keck Telescope in Hawaii. It is 10 meters in diameter and is composed of 36 1.8-meter hexagonal mirrors. The cost is 130 million U.S. dollars. It is mainly donated by Keck, an entrepreneur from the United States. After the successful construction of the first Keck telescope, the Keck Foundation invested in the construction of the Keck 2 telescope. The two are next to each other, which is extremely powerful; the other large telescopes include the two National Astronomical Observatories located in the northern and southern hemispheres. Eight-meter telescopes, one in Hawaii and one in Chile, collectively called the Gemini telescope; the Japanese built an eight-meter telescope called the Pleiades in Hawaii; the European Southern Observatory will build four eight-meter telescopes in the next century, with a combined aperture equivalent to 15 meters.
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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.
