Learn about and revise lenses and their power, real and virtual images, and ray diagrams with GCSE Bitesize Physics. BBC Homepage. Skip to content; ... Peep holes contain concave lenses.

Learn about and revise lenses and their power, real and virtual images, and ray diagrams with GCSE Bitesize Physics. BBC Homepage. ... A concave lens is thinner in the middle than it is at the edges.