Cylindrical Lens
A cylindrical lens has a cylindrical curved surface in one direction and a planar profile in the perpendicular direction, providing optical power in only one meridian. A spherical lens focuses light to a point; a cylindrical lens converges/diverges a beam into a focal line. Optical glass or quartz is common, with optional coatings; shapes are usually square/rectangular, or circular with cut edges. Positive (converging) types include the common plano-convex cylindrical lens, which focuses parallel light to a bright line, and the more strongly converging biconvex type. Negative (diverging) types include plano-concave lenses that spread light in one direction and more strongly diverging biconcave lenses. A meniscus cylindrical lens has one convex and one concave cylindrical surface for aberration correction.
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