About: http://webisa.webdatacommons.org/17876962

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	However, an optical retardation plate such as a ??/4 plate or a ??/2 plate and a polarizer may be used in combination, as necessary.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca