Plano-Concave lens

Plano- concave lens

Plano Concave lenses are thicker at the edge than in the centre and flat on one side. The Plano-concave lenses are used to expand light beams or to increase focal lengths in optical systems. It’s negative focal lengths and diverge collimated incident light. It forms only virtual images which are seen through the lens. It can reduce spherical aberration, coma and distortion.