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A beam of light converges to a point P.A...

A beam of light converges to a point P.A lens is placed in the path of the convergent beam `12 cm` from `P`. At what point does the beam converge if the lens is
(a) a convex lens of focal length `20 cm`. (b) a concave lens of focal length `16 cm` ?

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`(1)/(v)-(1)/(12)=(1)/(-16)`
`v=48 cm`
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