A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam. A simple lens is a lens consisting of a single optical element. A compound lens is an array of simple lenses (elements) with a common axis; the use of multiple elements allows more optical aberrations to be corrected than is possible with a single element.History · Construction of ... · Imaging properties · Aberrations

The word lens originally comes from the Latin word for lentil, since biconvex lenses are lentil-shaped. Lens (genus), the genus of the lentil plant; Lens (geometry), a geometric shape ...

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