Assertion: mirror's surface | /r/HasProperty | curved
Facets:
Source sentences:
text: Concave mirrors have a curved surface with a center of curvature equidistant from every point on the mirror's surface.
text: Their reflective surfaces may be either flat or curved.
text: Mirrors may have plane or curved surfaces.
text: A mirror is flat or curved surface usually produced of glass that has had a reflective coating applied to it.