Constructing a Cassegrain Telescope

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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 mirror. The final eyepiece or CCD (charge-coupled device) is not shown. You can assemble and disassemble the telescope by sliding the mirrors out of the tube, changing the mirror diameter and modifying the focal lengths.

Contributed by: Ann Williamson and Donald Barnhart (Optica Software, a division of iCyt Mission Technology) (March 2011)
Open content licensed under CC BY-NC-SA


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