How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
eGFI – For Teachers » Lesson: How Telescopes Work
Refracting telescope - Wikipedia
Reflecting telescope - Wikipedia
eGFI – For Teachers » Lesson: How Telescopes Work
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Galileo's telescope - How it works
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Galileo's telescope - How it works
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Figure: Galileo's refracting telescope (1609)
Refractive Telescopes
N.A.A.'s "How Telescopes Work" Guide
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Refractive Telescopes
How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
How Does a Refracting Telescope Work?
