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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