Plano-convex cylindrical lens

Plano-convex cylindrical lenses only focuses in one direction and has no focusing function in the other direction. The external dimensions of a plano-convex lens are similar, but only limited to a spherical mirror on one profile. A cylindrical lens can transform the light emitted by a luminous point into a line, and by placing two flat convex lenses perpendicular or intersecting with each other, surface light can be generated. The total focal length is the sum of each focal length.