2 3  The mirror equation
If rays emanating from a point actually meet at another point
after reflection and/or refraction, that point is called the image
of the first point The image is real if the rays actually converge
to the point; it is virtual if the rays do not actually meet but
appear to diverge from the point when produced
backwards An image is thus a point-to-point
correspondence with the object established through
reflection and/or refraction