About: http://webisa.webdatacommons.org/167238410

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, ??R is a quantity called retardation, ?? is the wavelength of light, d is the thickness of the liquid crystal layer, Io is the intensity of the incident light, and ?? and ?? are angles as shown in FIG. 8.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au