We are into dealing with high grade newton ring lens that is widely in demand for its durable nature. Our newton ring lens is available in ready stock sizes and that too at very reasonable prices. made from : optical crown glasstint glassapplying pressure with the help of apparatus attributes : one plain glassone spherical plano convex lensr.o.c. 100 and 50 cmfocal length of 200 & 100 cmhighly durable