Cassegrain telescopes

dcterms modified equal to or less than 2020-11-03T21:35:20.832Zequal to or more than 2020-11-03T21:35:20.832Z
broader original
202 original
definition A reflecting telescope whose primary mirror has a hole bored through the center to allow the reflected light from the convex secondary mirror be focused beyond the back end of the tube.
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contributor AAS_Frey.Katie_Admin original