A biconcave lens is one in which both sides of the lens are concave. A biconcave lens has a negative focal length, which allows the beam to diverge. Therefore, ...
A plano-concave lens is a lens that has a flat surface on one side and a concave surface on the other. A plano-concave lens has a negative focal length, which a...
Plano-convex lens is a kind of positive lens. Its main functions in the optical system are beam expansion, imaging, beam collimation, focusing collimation, beam...