In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.
A plano concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length, and can be used for light projection, beam expansion, or to increase focal length ...
In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.