Flat Concave Lens
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A flat concave lens is formed by machining a plane and a concave spherical surface. They form a negative focal length. Flat concave lenses are often used in optical systems to expand light beams or increase focal length.
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Flat convex lens is used in telescope, Telescopic sight, magnifier, light receiver and condenser. A flat convex lens is composed of a plane and a sphere, which, when combined with other lenses, can form an imaging system.
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