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[" Problem "2.42." A beam of light conve...

[" Problem "2.42." A beam of light converges to a point "],[P" .A lens is placed in the path of the convergent beam "],[12cm" from the point "P" .At what point the beam "],[" converges,if the lens is "(a)" a convex lens of focal length "],[20cm,(b)" a concave lens of focal length "16cm?" Do the "],[" required calculations."]

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