Science glossary film: Concave

Curving inwards, like the inside of a bowl. The term is usually used to describe lenses or mirrors, for example the concave mirrors in telescopes. Concave lenses, as opposed to the more common convex lenses, are thinner in the middle than at the edges.

The term is usually used to describe lenses or mirrors, for example the concave mirrors in telescopes. Concave lenses, as opposed to the more common convex lenses, are thinner in the middle than at the edges.