Figure: Galileo's refracting telescope (1609)
N.A.A.'s "How Telescopes Work" Guide
eGFI – For Teachers » Lesson: How Telescopes Work
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Meade Instruments Corporation - How Telescopes Work
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How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
ASTRONOMICAL TELESCOPE
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Refractive Telescopes
How does a telescope work?
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Making a Galilean Telescope
Refracting Telescopes
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Important Telescope Parts Functions » Code for People
Aligning Telescope Optics – Mark Thompson Astronomy
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How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
How does a radio telescope work?
How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
