An object is placed at a distance of 12 cm in front of a concave mirror

An object is placed at a distance of 12 cm in front of a concave mirror. It forms a real image four times larger than the object. Calculate the distance of the image from the mirror.

We know that,
image

We have, h = 4h; u = - 12 cm
image

Therefore, the image distance is 48 cm behind the mirror.