bi concave lens important terms
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Focus: Point at which parallel rays of light converge in a concave lens and parallel rays of light diverge from the point is called Focus or Principal Focus of the lens. Similar to centres of curvature; convex and concave lenses have two Foci. These are represented as F1 and F2.
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Bi-concave lenses have two inward curved surfaces. These lenses have a negative focal length. ... They are used to diverge incoming light or increase the focal length of an existing optical system.
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