About: gradient index lens

Premodifier: gradient index
Head noun: lens

Same concepts
http://dbpedia.org/resource/Gradient-index_optics

Broader concepts

label	provenance	confidence
objective lens	isap:167200836	0.690536
optical element	isap:5843505	0.615454

Narrower concepts

label	provenance	confidence
lens	isap:167201099	0.254305