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Plano-convex lens is an optical lens in which one side of the lens is flat and the other side is convex.
A plano-concave lens is a lens that has a flat surface on one side and a concave surface on the other side.
A biconvex lens means that both surfaces of the lens are convex. Its focal length is positive and mainly for the function of focusing.
The biconcave lens, also named double concave lens, is usually made of flint glass and used for beam divergence.
A meniscus lens is a lens with two spherical surfaces, convex on one side and concave on the other. The lens provides a smaller beam diameter to reduce beam waste and spherical aberration.
An achromatic lens is a lens designed to minimize chromatic aberration and spherical aberration.
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