Assertion: reflecting telescope | /r/HasProperty | popular
Facets:
Source sentences:
text: Reflecting telescopes are popular because they are easier to build than refracting telescopes.
text: Reflectors are popular down to 4 inches [10cm] aperture, refractors tend to more more popular for smaller apertures and binoculars popular for the widest fields.
text: Reflecting telescopes are popular because they are easier to build than refracting telescopes.