# Question #08234

##### 1 Answer

Jan 30, 2017

We know the mirror formula as below

#color(blue)(1/v+1/u=2/r)#

where

Here it is also given that size of the virtual image seen behind the mirror is twice that of object.This means the magnification

Again

So

Inserting these values in mirror equation we get

#color(green)(1/v+1/u=2/r)#