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%ما هو (من)٪ 1 - تعريف
OVRO 40 meter Telescope
RADIO TELESCOPE IN CALIFORNIA
The OVRO 40 meter Telescope is a radio telescope at the Owens Valley Radio Observatory near Big Pine, California, US. It is owned and operated by Caltech.
40-foot telescope
![The remaining 10 ft section of the telescope, now at the [[Royal Observatory, Greenwich]]](https://commons.wikimedia.org/wiki/Special:FilePath/Remaining section of the 40ft telescope.jpg?width=200 "The remaining 10 ft section of the telescope, now at the [[Royal Observatory, Greenwich]]")
![Bath]]](https://commons.wikimedia.org/wiki/Special:FilePath/William Herschel Museum - 40-foot telescope model 1.jpg?width=200 "Bath]]")
REFLECTING TELESCOPE CONSTRUCTED BETWEEN 1785 AND 1789 AT OBSERVATORY HOUSE IN SLOUGH, ENGLAND
Great Forty-Foot telescope; Great Forty-Foot; 40 foot telescope; William Herschel's Telescope; 40-ft telescope
William Herschel's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a diameter primary mirror with a focal length (hence its name "Forty-Foot").
Refractor
.jpg?width=200 "The Yerkes Great refractor mounted at the 1893 World's Fair in Chicago; the tallest, longest, and biggest aperture refractor up to that time.")
![Vienna University Observatory]]](https://commons.wikimedia.org/wiki/Special:FilePath/Refraktor Wien Kerschbaum 1.jpg?width=200 "Vienna University Observatory]]")
![in}} refractor, at [[Yerkes Observatory]], the largest achromatic refractor ever put into astronomical use (photo taken on 6 May 1921, as Einstein was visiting)](https://commons.wikimedia.org/wiki/Special:FilePath/Yerkes Observatory Astro4p7.jpg?width=200 "in}} refractor, at [[Yerkes Observatory]], the largest achromatic refractor ever put into astronomical use (photo taken on 6 May 1921, as Einstein was visiting)")
TYPE OF OPTICAL TELESCOPE
Refractor; Refractor telescope; Refractive telescope; Galilean Telescope; Refracting Telescope; Galilean telescope; Keplerian telescope; Keplerian Telescope; Refractor Telescope; Kepler refractor; Galileo Telescope; Galileo's telescope; Refractory telescope
·noun Anything that refracts.
II. Refractor ·noun A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens.
