About: http://webisa.webdatacommons.org/420802771

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 n is the refractive index of the propagation medium, m is a grating diffraction order and d is the grating period.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr