Cassegrain telescope

noun
Cas·​se·​grain telescope | \ ˈka-sə-ˌgrān- How to pronounce Cassegrain telescope (audio) \
variants: or less commonly Cassegrain or Cassegrainian telescope \ ˌka-​sə-​ˈgrā-​nē-​ən-​ How to pronounce Cassegrainian telescope (audio) \

Definition of Cassegrain telescope

: a reflecting telescope that has a paraboloidal primary mirror and hyperboloidal secondary mirror, is equivalent in its optical effects to a telephoto lens, and usually has the light brought to a focus through a perforation in the center of the primary mirror

First Known Use of Cassegrain telescope

1806, in the meaning defined above

History and Etymology for Cassegrain telescope

after Laurent Cassegrain †1693 French priest and teacher credited with its invention

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The first known use of Cassegrain telescope was in 1806

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