About: http://webisa.webdatacommons.org/111315737

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	Instead of a plane-parallel plate the element 20 may also be another optical element, such as a combination of prisms or a lens.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com