About: http://webisa.webdatacommons.org/167036249

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	Where the two media have differing indices of refraction, such as for air and a sample as in FIG. 2( a), the beam will refract to form a spot of diameter L1 at a layer, surface, or interface of the sample.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com