We look our face in each mirror, in one after the other. First we keep our face quite close to the mirror and then move it slowly away from the mirror.
- If the image formed is of same size as our face but laterally inverted for all positions, then it is a plane mirror.
- If the image formed is erect and enlarged initially but gets inverted as the face is moved away, then it is a concave mirror.
- If the image formed is erect and smaller in size for all positions then it is a convex mirror.