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A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic ...
Lewis and Clark took three gross of curtain rings with them on their famous expedition to the Pacific coast in 1804, expecting to give them as presents to the natives of the North American interior. [2] In the 19th century, Mr Rees designed a curtain ring which would not catch upon the curtain rail and so would go smoothly around curves and ...
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
The Cassegrain reflector is named after a published reflecting telescope design that appeared in the April 25, 1672 Journal des sçavans which has been attributed to Laurent Cassegrain. [3] Similar designs using convex secondary mirrors have been found in the Bonaventura Cavalieri 's 1632 writings describing burning mirrors [ 4 ] [ 5 ] and ...
The locations of lunar retroreflectors left by Apollo (A) and Luna (L) missions. Retroreflectors are devices which reflect light back to its source. Six retroreflectors were left at six sites on the Moon by three crews of the Apollo program, two by remote landers of the Lunokhod program, one by the Commercial Lunar Payload Services program and one by the Chandrayaan program. [1]
Marine radar uses X-band microwaves with wavelengths of 2.5–3.75 cm (1–1.5 inches), so small reflectors less than 30 cm (12 inches) across are used. In aircraft navigation, corner reflectors are installed on rural runways, to make them show up on aircraft radar.
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