Assertion: radio telescope's surface | /r/HasProperty | polished
Facets:
value: perfectly
type: DEGREE
value: in a mirror
type: LOCATION
Source sentences:
text: In a lens the entire volume of material has to be free of imperfection and inhomogeneities, whereas in a mirror, only one surface has to be perfectly polished.
text: In a lens the entire volume of material has to be free of imperfection and inhomogeneities, whereas in a mirror, only one surface has to be perfectly polished.