Assertion: newtonian telescope | /r/CapableOf | use mirror
Facets:
value: unlike refractors
type: OTHER
value: to do their work
type: PURPOSE
value: to produce the image
type: PURPOSE
Source sentences:
text: Instead, it used mirrors that were shaped and ground to form an optical surface.
text: The Newtonian reflector is using mirrors to produce the image in the eyepiece.
text: Unlike refractors, which make use of optical lenses, Newtonian reflectors utilize mirrors to do their work.