About: http://webisa.webdatacommons.org/116268163

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	Other optical elements, such as lenses and mirrors, may be added to further improve the optical qualities of the light beam produced, to enhance the efficiency of the polarization conversion, or for simple convenience.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es