Cassegrain reflector
nounEtymology
Named after Laurent Cassegrain, its probable inventor.
Definitions
A combination of a primary concave mirror and a secondary convex mirror, often used in…
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.
The neighborhood
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA