<http://dbpedia.org/resource/Geometrical_optics>	<http://xmlns.com/foaf/0.1/depiction>	<http://commons.wikimedia.org/wiki/Special:FilePath/Plane_wave_wavefronts_3D.svg> .
<http://dbpedia.org/resource/Geometrical_optics>	<http://dbpedia.org/ontology/thumbnail>	<http://commons.wikimedia.org/wiki/Special:FilePath/Plane_wave_wavefronts_3D.svg?width=300> .
<http://dbpedia.org/resource/Geometrical_optics>	<http://www.w3.org/2000/01/rdf-schema#comment>	"Geometrical optics, or ray optics, describes light propagation in terms of rays."@en .