The Refracting Telescope
The image from the first lens is the object for the second lens. Images are inverted, but who cares for a star?
The Terrestrial Telescope:
The inverting lenses are to flip the image right side up for earth viewing.
The Newtonian Reflector
Mirrors and lens bring the image out the top.
Mt. Polomar Dome
The 5 meter Reflector at Polomar
The astronomer rides in the top at the upper left.
The great 5-meter telescope in action. Video
Cassegrainian Reflecting Telescope
Astronomer (films) go at the bottom under the primary mirror which has a hole in the center.
Lick dome and 3-meter Cassegranian Reflector.
Subaru Pleiades 264 mirror reflector on Mauna Kea
Ah, the principle of Archimedes' many mirrors focusing together. Now we can have 10 and 15 meter telescopes like this with the mirrors computer focused.
The gravity of galaxies focuses light from far behind them.
