Telescopes 101: Essential things to know - Astronomy Magazine
https://www.astronomy.com/observing/telescopes-101-15-essential-things-to-know/
WEBFeb 12, 2024 · The three main types of telescopes use lenses, mirrors, or a combination of both. Refracting telescopes use lenses — combining at least two, and as many as four, pieces of glass — as their...
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