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[" A beam of light converges to a point ...

[" A beam of light converges to a point "P" .A lens is placed in the path of the convergent "],[" beam "12cm" from "P" .At what point does the beam converge if the lens is "],[" (i) a convex lens of focal length "20cm" ,(ii) a concave lens of focal length "16cm?],[" Do the required calculations."]

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