0 a type of telescope (= a device for making objects that are far away look closer and larger) that uses a mirror or mirrors to reflect light and form an image:
Isaac Newton built the first reflecting telescope in 1668.
His mother bought him a 6-inch reflecting telescope, and he soon was involved in the school astronomy club.
Reflecting telescopes have big curved mirrors instead of smaller, pricier lenses.
Astronomers quit building big refracting telescopes when they found they could more easily and cheaply build even bigger, more powerful reflecting telescopes using mirrors.
I have been unable to find the spiral galaxy with my binoculars, though it is clear enough in a 15-cm reflecting telescope.
It has been used as stiff lightweight structural material, specifically for support of reflecting telescope mirrors.
The design comprises a reflecting telescope with a 39.3 metre diameter segmented primary mirror, a 4.2 metre diameter secondary mirror, and will be supported by adaptive optics and multiple instruments.
Gregory pointed out that a reflecting telescope with a parabolic mirror would correct spherical aberration as well as the chromatic aberration seen in refracting telescopes.
One was the reflecting telescope.
