Assertion: reflecting telescope's mirror | /r/HasProperty | ground
Facets:
value: very precisely
type: DEGREE
Source sentences:
text: The incorrect assembly of this device resulted in the mirror being ground very precisely but to the wrong shape.
text: Instead, the fact that the mirror had been ground so precisely to the wrong shape led to the design of new optical components with exactly the same error but in the opposite sense, to be added to the telescope at the servicing mission, effectively acting as "spectacles" to correct the spherical aberration.
text: A special 240 in (6.1 m) 25,000 lb (11 t) mirror cell jig was constructed which could employ five different motions when the mirror was ground and polished.