http://demonstrations.wolfram.com/ConstructingACassegrainTelescope/
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This Cassegrainian telescope consists of a primary paraboloidal reflector and a secondary hyperboloidal reflector. Light reflecting from the main mirror is reshaped into a narrower beam by the secondary mirror that passes through a hole cut in the main ...
Contributed by: Ann Williamson and Donald Barnhart (Optica Software, a division of iCytTM Mission Technology)
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