= reflector, n. 3.
| 单词 | θ64753 |
| 释义 | the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > reflecting telescopes (9) reflecting telescope1672 = reflector, n. 3. reflector1735 Astronomy. A telescope in which a mirror is used to collect and focus the light; = reflecting telescope n. at reflecting, adj. compounds. Cf… speculum1789 transferred. A telescope fitted with a speculum. Herschelian telescope1792 Of or relating to Sir William Herschel or his son Sir John Herschel. Herschelian telescope n. a form of reflecting telescope having a concave mirror… Newtonian1820 A Newtonian reflecting telescope. reflector telescope1840 = sense 3. Cassegrain1888 Applied to a modification of the Gregorian reflecting telescope suggested in 1672 by M. Cassegrain. Also Cassegrain, used attributively and absol. Nasmyth1960 Astronomy. attributive. Designating or relating to a Nasmyth–Cassegrain. Nasmyth flat n. the tertiary plane mirror used to deflect through 90… Nasmyth–Cassegrain1972 An altazimuth reflecting telescope in which light from a Cassegrain secondary mirror is reflected by a tertiary plane mirror through 90 degrees… |
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