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• How camera lenses affect what the viewer sees
A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, concentrating 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. Manufactured lenses are typically made of glass or transparent plastic. Elements which refract electromagnetic radiation outside the visual spectrum are also called lenses: for instance, a microwave lens can be made from paraffin wax.
The archaic spelling lense is sometimes seen, but Merriam Webster's medical dictionary is the only major dictionary that considers this to be correct.
The oldest lens artefact is dated to c.640 BC, a rock crystal lens found at excavations in Niniveh. The earliest written records of lenses date to Ancient......

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