About: http://webisa.webdatacommons.org/419748284

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, such as symmetric convex lenses each having a 10 mm focal length with a 10 mm diameter, focus light emitted from the light sources and also focus light onto a detector.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com