I know that most of the objects around us, like tables, doors etc reflect irregularly and do not form an image. I know that to form a real image, a lot of reflected rays must converge, and this is not possible for diffused or irregular reflection. But my question is: Why do these opaque objects that reflect irregularly not form a virtual image?
When an image is formed by a lens or a mirror, ray bundles which originate from a single point on the objective (and thus are 'related' to each other in that sense) are focused back into a point in the image plane.
A diffuser, by definition, scatters the light rays in a random manner, thus the rays are no longer related to each other, that is to say, no longer form a bundle, and thus cannot be focused into a point in the image plane.