Plano-concave Lenses have one concave surface. It has negative focal length. It is often used to expand light or to increase focal length in existing systems. With Ar Coating Fused Silica Plano Concave Optical Lens, Fused Silica Plano Concave Optical Lens,Plano Concave Optical Lens Fuzhou A-Star photonics inc. specialize in the design and volume manufacturing […]