In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

Convex and concave lenses can both be used to correct defects of vision. The most commonly occurring defects of vision are ‘short sightedness’ and ‘long sightedness’. People who are ‘short sighted’ ...

Optical Surfaces Ltd. is a leading international supplier of concave and convex spherical mirrors made to your exact specification. A spherical mirror is a mirror which has the shape of a piece cut ...