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A particular telescope is set up to use the coudé focus. What arrangement of mirrors is used to ...

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A particular telescope is set up to use the coudé focus. What arrangement of mirrors is used to ...

A particular telescope is set up to use the coudé focus. What arrangement of mirrors is used to bring the light to this focus?
A)   A curved primary mirror followed by a series of plane and curved mirrors that channel the light to a remote and fixed location
B)   A concave primary mirror followed by a convex secondary mirror that reflects light back through a hole in the primary mirror
C)   A concave primary mirror followed by a concave secondary mirror that reflects light back through a hole in the primary mirror
D)   A concave primary mirror and a flat, diagonal secondary mirror mounted at a 45° angle to the telescope axis

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Discovering the Universe

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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