To form an image it is not necessary for all rays coming from a source to meet in one place. Even in the case of spherical mirrors the position of the image of a point source of light depends on where the eye is. All the places where the image can bee seen form a curve called caustics. In the picture below each eye looking at a convex mirror has its own image of the point. When we look with two eyes (stereoscopic view) our perception is very complicated.