Lenses (components)

Pieces of glass, crystal, plastic, or other transparent substance characterized by having two curved surfaces or one plane and one curved surface, serving to cause regular convergence or divergence of the rays of light passing through it. Lenses are used for magnifying vision in eyeglasses, binoculars, telescopes, microscopes, cameras, and for directing or magnifying light in lighting devices such as flashlights or lighthouses.