A lens is an optical component whos surface curvature and refractive index are designed such that the direction of light incident upon it is controlled.

Formulae exist for thin lens approximations to determine focal lengths etc.

For an object at distance d whos image is formed at d'


The ratio of the curvatures of a lensís two refracting surfaces.

See also: Abaxial, Axicon Lens, Back Focal Length, Blur Circle, Camera Lens, Concave Lens, Converging Lens, Convex Lens, Focal Length, f-stop, Lens Mount, Rayleigh Criterion, Telecentric Lens, Truncation Ratio.

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Subjects: Optics