Old Refracting Telescope - 搜索图片

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planetfacts.org
What is A Refracting Telescope – Uses Lens as Its Optical Element
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polizrealtime.weebly.com
Refracting telescope - polizrealtime
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si.edu
Refracting Telescope | Smithsonian Institution
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University of Queensland
Refracting Telescope - Physics Museum - The University of Queensland, Australia

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