Beam Expander Design Comparison: Keplerian and Galilean
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File:Comparison optical telescope primary mirrors.svg - Wikimedia Commons
Comparison of Galilean and Keplerian telescopes. - American Academy of Ophthalmology
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Kelperian Telescopes 1673-4
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History of Science Society -- Committee on Education
telescope_keplerian.gif
telescope
Galileo's telescope - How it works
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History of Science Society -- Committee on Education
