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Reflecting Telescopes

Reflecting Telescopes
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Description: Four of the most common optical designs for reflecting telescopes:
(a) Newtonian focus (popular among amateur astronomers) and the three major designs
used by researchers—(b) Cassegrain focus, (c) Nasmyth focus or coudé focus, and (d) prime focus.

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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15871
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