Concave lenses are considered to be negative lenses because light waves passing through them diverge, or are scattered away from, a focal point or centerline. This divergence occurs because the lens is thinner in the center and thicker on the periphery, causing light entering the lens to be refracted away from its center.

Plano-concave lenses are the most common optical elements used for beam expansion and light projection. With antireflective coatings, these lenses are used in various optical assemblies, optical systems (to increase focal lengths) and lasers. Review specifications and typical sizes tables below for more details. In addition to the lenses listed below, Syntec is able to provide custom manufactured lenses in different diameters, made to your specific requirements.