1.

A real object is placed at a distance f from the pole of a convex mirror, in front of the convex mirror. If focal length of the mirror is f, then distance of the image from the pole of the mirror is ........

Answer»

`f/2`
`f/4`
`2F`
`4F`

SOLUTION :f is positive for convex mirror
`THEREFORE 1/f=1/u+1/v`
`therefore 1/f=(1)/(-f)+(1)/(v)`(by u=-f)
`therefore 1/f+1/f=1/v`
`therefore2/f=1/v`
`therefore v=f/2`


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