Refracting Telescopes - an overview | ScienceDirect Topics
The Optics of Telescopes | Let's Talk Science
telescope | History, Types, & Facts | Britannica
Refracting telescope - Wikipedia
Refracting Telescopes - an overview | ScienceDirect Topics
Imaging with the Great Lick Refractor - BBC Sky at Night Magazine
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How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
Galileo's Refracting Telescope | Multiwavelength Astronomy
Telescopes
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Refractor vs Reflector Telescope – What Is The Difference?
Refracting Telescopes
History of the Detroit Observatory
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The Optics of Telescopes | Let's Talk Science
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Telescopes 101 | Astronomy.com
The Optics of Telescopes | Let's Talk Science
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Telescopes
The Irving Porter Church Telescope
