Question

A convex mirror of focal length f produced an image `(1//n)^(th)` of the size of the object. The distance of the object from the mirror is
A. `(n-1)f`
B. `((n-1)/(n))f`
C. `((n+)/(n))f`
D. `(n+1)f`

Answer 1

Correct Answer - A
`m=+(1)/(n)=-(v)/(u)impliesv=-(u)/(n)`
By using formula `(1)/(f)=(1)/(-u/n)+(1)/(u)`
`impliesu=-(n-1)f`