1.

An image of an object obtained by a convex mirror is n times smaller than the object. If the focal length of lens is f, the object distance would be ...........

Answer»

`F/n`
`(f)/((n-1))`
`(n-1)f`
nf

Solution :For convex MIRROR image is always VIRTUAL and magnification m=`v/u`
here, `m=1/n`
`THEREFORE 1/n=v/u`
`therefore v =u/n`
now,`1/f=1/u+1/n`
`therefore1/f =(1)/(-u)+n/u`
`therefore 1/f=(-1+n)/(u)`
`therefore u=(n-1)f`


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