About: http://webisa.webdatacommons.org/143133874

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	An optical system including a shutter, a reflector such as a mirror or a half mirror, a cylindrical lens, a convex lens, or the like may be provided to adjust the shape or path of electromagnetic waves.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com