Crave the Wave

New Cartesian Convention:

1. All distances are measured from the pole of the mirror as origin 2. Distances measured against the incident light ar negative 3. Distances measured in the same direction as the incident light are positive 4. Heights measured perpendicular to the principal axis, in the upward direction are taken as positive 5. Heights measured perpendicular to the principal axis, in the downward direction are taken as negative

Application: