About: http://webisa.webdatacommons.org/315321370

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	Lenses try to correct for this by sandwiching together different densities of glass, but they have to take compromises - there is no such thing as perfect as it would compromise on something else.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com