About: http://webisa.webdatacommons.org/351413426

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	Here, the distance L is perpendicular to an optical axis extending from the reference point to the coupled plane, and the distance D is a distance along the optical axis from the reference point.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com