Premodifier: refractive
Head noun: index

Same concepts
http://dbpedia.org/resource/Refractive_index

Narrower concepts

labelprovenanceconfidence
materialisap:3579256860.298789
caseisap:934570460.287940
light beamisap:896662150.232291
lensisap:868945530.209399
ta2o5isap:3674780480.205049
nisap:1316338950.158476
n1isap:4644516910.140894
variationisap:156446080.128039
glassisap:3706516760.101384
kisap:1310842160.073729
diisap:4640990170.047473