Assertion: cassegrain reflector | /r/ObjectUse | used in radio antennas
Facets:
value: often
type: TEMPORAL
Source sentences:
text: The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas.
text: The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas.