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telescope British & World English

An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified

telescope English Thesaurus

the five steel sections telescope into one another

radio telescope British & World English

An instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites

space telescope British & World English

An astronomical telescope that operates in space by remote control, to avoid interference by the earth’s atmosphere

X-ray telescope British & World English

A telescope designed to detect sources of X-rays

Galilean telescope British & World English

An astronomical telescope of the earliest type, with a biconvex objective and biconcave eyepiece

Maksutov telescope British & World English

A type of catadioptric telescope having a deeply curved meniscus lens and a spheroidal primary mirror. A secondary mirror on the back of the lens brings the light to a focus just behind a hole in the primary mirror

Schmidt telescope British & World English

A type of catadioptric telescope used solely for wide-angle astronomical photography, with a thin glass plate at the front to correct for spherical aberration. A curved photographic plate is placed at the prime focus inside the telescope

Cassegrain telescope British & World English

A reflecting telescope in which light reflected from a convex secondary mirror passes through a hole in the primary mirror

equatorial telescope British & World English

An astronomical telescope on an equatorial mount

Gregorian telescope British & World English

An early reflecting telescope in which light reflected from a concave elliptical secondary mirror passes through a hole in the primary mirror. It was rendered obsolete by the introduction of Newtonian and Cassegrain telescopes

Newtonian telescope British & World English

A reflecting telescope in which the light from the main mirror is deflected by a small flat secondary mirror set at 45°, sending it to a magnifying eyepiece in the side of the telescope

reflecting telescope British & World English

A telescope in which a mirror is used to collect and focus light

refracting telescope British & World English

A telescope which uses a converging lens to collect the light

terrestrial telescope British & World English

A telescope used for observing terrestrial objects, which gives an image that is not inverted

Hubble Space Telescope British & World English

An orbiting astronomical observatory launched in 1990. The telescope’s fine high-resolution images are far better than can be obtained from the earth’s surface

Schmidt–Cassegrain telescope British & World English

A type of catadioptric telescope, using the correcting plate of a Schmidt telescope together with the secondary mirror and rear focus of a Cassegrain telescope

altazimuth telescope in altazimuth British & World English

A telescope on an altazimuth mounting