... .5 , B=40/20 , C=0.01 Flat-convex led optical lens 1),Material: Monocrystal line silicon N shape2),Resistivity: 5 ... -40Ω, crystallographic orientation 1113),Shape: concave, convex, flat, etc. ... 4),Specification: Φ6-Φ22 5),Center thickness: 1.5-2.5mm6), Precision (the highest ...