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A concave mirror of focal lengthfproduce...

A concave mirror of focal length`f`produces a real image`n`time the size of the object.What is the distance of the object from the mirror.

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`m=-n,m=(f)/(f-u)`
`-n=(-f)/(-f-u)rArrnf+n u=-f`
`n u=-f-nf rArr u=(-(n+1))/(n)f`
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