a transparent optical device used to converge or diverge transmitted light and to form images | lens used to concentrate light on an object |
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons | an electrical device characterized by its capacity to store an electric charge |
biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina | a hollow coil that condenses by abstracting heat |
(metaphor) a channel through which something can be seen or understood | an apparatus that converts vapor into liquid |