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If real image obtained from concave mirror of focal length f is n times of object, then find object distance.

Answer»

(n − 1)f
(n + 1)f
`((n+1)/(n))f`
`((n-1)/(n))f`

Solution :Magnification of CONCAVE mirror,
`m=(f)/(f-u)`
`-n=(f)/(f-u)`
`THEREFORE u-f=f/n``thereforeu=f+f/n`
`therefore u =((n+1)/(n))f`


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