Designers of refracting telescopes figured out, for one, that by using two different kinds of glass together in the objective lens, they could cause the red and blue ends of the spectrum to ...

The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...

Refracting: A refracting telescope, also known as a refractor telescope, is a type of optical telescope that uses refracting optics such as lenses to form an image. Catadioptric: A catadioptric ...

9.53 inch Clark Refractor The main telescope is the original 9.53 inch refractor built in 1885. The objective lens was made by Alvin Clark and Sons of Cambridge, Massachusetts, and has a focal length ...

Should you buy a telescope with a refracting lens or a reflecting mirror? It depends on what you want to look at, and your ...