| Lenses Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex if both surfaces are convex, likewise, a lens with two concave surfaces is biconcave. If one of the surfaces is flat, the lens is plano-convex or plano-concave depending on the curvature of the other surface. A lens with one convex and one concave side is convex-concave, and in this case if both curvatures are equal it is a meniscus lens. |
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Plano-Convex Lenses have a positive focal length, making them ideal for collecting and focusing light in imaging applications. They are also useful in a variety of applications involving emitters, detectors, lasers, and fiber optics. |
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A Plano-Concave Lens is a divergent or negative lens, thicker at the edge than in the center and flat on one side. It forms a virtual image and is frequently used to extend the effective focal length of a converging lens when they are used as a pair. We suggest that negative focal lengths be stated in order. |
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