Answer:

4cm

Explanation:

First of all we find out the position of the image. By the position of image we mean the distance of image from the lens.

Here, Object distance, u=-12 cm (it is to the left of lens)

Image distance, v=? (To be calculated)

Focal length, f=+8 cm (It is a convex lens)

Putting these values in the lens formula:

1v−1u=1f

We get: 1v−1−12=18

or 1v+112=18

or 1v+112=18

1v=18−112

1v=3−224

1v=124

So, Image distance, v=+24 cm

Thus, the image is formed on the right side of the convex lens. Only a real and inverted image is formed on the right side of a convex lens, so the image formed is real and inverted.