<http://webisa.webdatacommons.org/183599090>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<opfocus.org> .
<http://webisa.webdatacommons.org/183599090>	<http://www.w3.org/ns/prov#value>	"Consider, for example, one of the simplest light beams: a Gaussian light beam, such as the one generated by a laser pointer." .
<http://webisa.webdatacommons.org/prov/74023457>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/183599090> .
<http://webisa.webdatacommons.org/183599090>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .