1.

A concave mirror of focal length `f` produces a real image `n` times the size of the object. The distance of the object from the mirror isA. `(n-1)f`B. `(n+1)f`C. `(n+1)/(n)f`D. `(n-1)/(n)f`

Answer» Correct Answer - C
Since image is real and inverted
`m=-n`
let `u=-x`
`m=(v)/(u)implies-n=-(v)/(-x)`
`v=-nx`
`(1)/(v)+(1)/(u)=(1)/(f)`
`(1)/(-nx)+(1)/(-x)=(1)/(-f)implies(1+n)/(nx)=(1)/(f)`
`x=((n+1)/(n))f`


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