Optical telescopes are built to detect visible light waves and then to reflect the light using mirrors, or refract (bend) it with lenses, focusing it into an image.
(Optical telescopes; are built; to detect visible light waves and then to reflect the light using mirrors, or refract (bend) it with lenses)
Optical telescopes
are built
to detect visible light waves and then to reflect the light using mirrors, or refract (bend) it with lenses