BabelNet

bn:00016493n

Noun Concept

Categories: Antennas (radio), Radio frequency propagation, Scottish inventions, Telescope types, Radio frequency antenna types

Cassegrainian telescope Gregorian telescope Cassegrain reflector Cassegrain mirror system Cassegrain reflecting telescope

A reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror WordNet 3.0

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The Gregorian telescope is a type of reflecting telescope designed by Scottish mathematician and astronomer James Gregory in the 17th century, and first built in 1673 by Robert Hooke. Wikipedia

The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture. Wikipedia

A design used in telescopes Wikipedia Disambiguation

Type of reflecting telescope that uses Cassegrain mirror system Wikidata

Main design element of Cassegrain reflecting telescope Wikidata

type of reflecting telescope Wikidata

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