About: http://webisa.webdatacommons.org/119037177

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	That is, the refracting optical system B is classified as an optical system constructed of only a refracting optical member such as a lens without including the concave reflecting mirror.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com