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[" 25.A beam of light converges to a poi...

[" 25.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 does the beam converge if the lens is a "],[" convex lens of focal length "20cm" ."],[qquad " Section "-D]

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