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2014-11-27T18:14:33+05:30

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F = focal length
u = image distance 
let v be the image distance
height of object = b

\frac{1}{f}=\frac{1}{v}+\frac{1}{u} 

v=\frac{fu}{f+u}

so magnification = -v/u 

let h = object height = b
    h' = object height

so h'/h = -v/u 

    h' = -vh/u

 h'=\frac{-f*u*b}{f+u}    ANSWER
 

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