N.A.A.'s "How Telescopes Work" Guide
Optical Telescope - How Does it Work?
How optical telescopes see the universe | Cosmos
Optical telescope - Wikipedia
Galileo's telescope - How it works
Understanding Eyepieces | Starizona
Telescope Equations
Figure: Galileo's refracting telescope (1609)
How Does a Refracting Telescope Work?
How optical telescopes see the universe | Cosmos
How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
Telescopes - Astronomy and our universe
The Challenge of Adaptive Optics - Sky & Telescope - Sky & Telescope
How Do Telescopes Work? | NASA Space Place – NASA Science for Kids
How Does a Refracting Telescope Work?
How They Work - How Telescopes Work | HowStuffWorks
eGFI – For Teachers » Lesson: How Telescopes Work
Telescopes - Astronomy and our universe
File:Comparison optical telescope primary mirrors.svg - Wikimedia ...
Q & A: How Do Telescopes Work? | Department of Physics ...
Optical Telescopes - WHS Physics ( Old Site )
How does a telescope work?
Optical telescope - Wikipedia
Optical Telescope: Facts & Overview - Video & Lesson Transcript ...
Reflecting Telescope - Guides On How To Get Started
How does a Schmidt-Cassegrain telescope work? - Quora
