Define focal length of divergent lens
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Focal length is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror the point where parallel rays of a light meet,or converge
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when a ray of light incident parllely on the concave lens it appears to diverge away from a point on the principal focus ,this point is called focus and the distance between the focus and optical centre is called focal length
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