Assertion: radio telescope's reflector | /r/HasProperty | large
Facets:
value: very
type: DEGREE
value: to focus the waves
type: PURPOSE
Source sentences:
text: For example a 130-150 mm Newtonian reflector, 80-120mm refractor or a 90-130mm Maksutov Cassegrain of a moderate quality.  - Large (price range 600$ and higher).
text: The spherical reflector can be very large because it is does not move.
text: Due to the long wavelengths of radio waves, the reflectors of radio telescopes must be very large to focus the waves at a good resolution.