http://demonstrations.wolfram.com/CassegrainTelescope/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows the simplest version of a Cassegrain reflecting telescope, invented by Laurent Cassegrain, ca. 1672. The primary paraboloidal mirror focuses incoming light toward a hyperboloidal mirror suspended on the axis of the telescope's c...
Contributed by: S. M. Blinder
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