About: http://webisa.webdatacommons.org/81515175

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	A lens is a transparent refracting medium, bounded by one or two surfaces, one or both of which are usually curved.
http://www.w3.org/ns/prov#wasQuotedFrom	h2g2.com