About: http://webisa.webdatacommons.org/375565175

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	The zones are formed by radii (Rn)2 =fN ?? where f is the focal length of the zone target, N is an integer, and ?? is the wavelength of radiation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com