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doit_the_clown doit_the_clown
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When light from the concave primary mirror of a telescope is reflected by a small secondary mirror through a hole in the primary to its focus, this is called the
   A)  Cassegrain focus.    B)  Newtonian focus.    C)  coudé focus.    D)  prime focus.
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Discovering the Universe

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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doit_the_clown Author
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7 years ago
Just got PERFECT on my quiz
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You make an excellent tutor!
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This site is awesome
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