Assertion: newtonian telescope's design | /r/HasProperty | refractor
Facets:
Source sentences:
text: Telescopes come in three basic designs: refractor, reflector, and catadioptric, plus some variations on each of the types.
text: The basic designs are refractors, reflectors, and catadioptric telescopes (which include SCTs).
text: The most popular remaining designs are refractors and Schmidt-Cassegrain telescopes (SCTs).