The diameter tolerance of a plano concave lens describes the acceptable value of ranges for the diameter. It has no effect on the performance of the lens, but relates to how the lens is fitted into ...

Plano convex lenses, Plano concave lenses, Bi-convex lenses, Bi-concave lenses, meniscus lenses, achromatics lenses, ball lenses, aspheral lenses and cylindrical lenses Specifications: Material: Bk7, ...

US researchers have focused a plane microwave by a plano-concave lens fabricated from a photonic crystal specially designed to have negative refractive index and left-handed electro-magnetic ...