Refracting telescope - Wikipedia
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Amazon.com : Telescope 80mm Aperture 600mm - for Beginners & Adults Astronomical Refracting Telescopes AZ Mount Tripod Fully Multi-Coated Optics 24X-180X High Magnification, with Wireless Control, Carrying Bag : Electronics
Refracting telescope - Wikipedia
Reflecting Telescope
Refracting Telescopes - an overview | ScienceDirect Topics
