Answer to Question #348184 in Optics for Didi

Question #348184

An object placed 12cm in front of a convex lens produced a virtual image of magnification 3.0. Calculate the focal length of the lens

Expert's answer

$d=12~cm,$

$f=\frac d3=4~cm,$

$F=\frac{fd}{f+d}=3~cm.$

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