Reflecting telescopes use a concave mirror at the base of the telescope, called the primary (and sometimes objective), to collect and focus light from the object being viewed.
(the object; being viewed; ) (Reflecting telescopes; use; a concave mirror; L:at the base of the telescope) (Reflecting telescopes; called; the primary (and sometimes objective; to collect and focus light from the object)
the object Reflecting telescopes Reflecting telescopes
being viewed use called
a concave mirror L:at the base of the telescope
the primary (and sometimes objective to collect and focus light from the object