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Cassegrain focus:see telescopetelescope,
traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of
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Cassegrain focusSee Cassegrain configuration.
Cassegrain focus[kas·gran ′fō·kəs]
The principal focus of a Cassegrain telescope, located just behind the primary mirror.