An object is at a distance of 0.5 in front of a plane mirror. Distance between the object and image is

Explanation

We can first form the image of O, and then treat the mirror as a window through which we can view the image. Let us see that the region in which the image is formed.This will define the region in which the observer can see the image.
Calculation : Here we can see that the image, the mirror, and the lenght of the road when the image is visible from two triangles as shown in Fig. 33-23. We can say that the mirror acts like a window through which we can see the image of the object.This makes two triangles which are similar to each other. By the property of similar triangles, we can say that
`(d)/(d + x) = (2d)/(12d)`
`x = 5d`.