About: http://webisa.webdatacommons.org/277986387

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	Generally the weak lens should have a focal length between about 1 and 10 times the overall length of the optical system, i.e. distance between the diode and the target.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca