About: http://webisa.webdatacommons.org/308586519

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	On the other hand, the object points such as B, situated at distances r less than r1, give rise to image circles of a diameter ?? = 2 ???r1 2 - r2.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com