  In this work, I have derived the equation of the curve obtained on reflection
of a point object in an arbitrary curved mirror if the object and the mirror
are placed on the 2D Cartesian plane. I have used only the basic laws of
reflection of classical geometric optics and elementary coordinate geometry.
Several examples are provided and compared with Gaussian optics. We also see
how the equations reduce to the standard mirror formula under the paraxial
approximation.
