European Journal of Physics
The first-order equation relating object and image location for a mirror of arbitrary conic-sectional shape is derived. It is also shown that the parabolic reflecting surface is the only one free of aberration and only in the limiting case of distant sources.
Castano, D., & Hawkins, L. C. (2011). Conicoid Mirrors. European Journal of Physics, 32, (2), 399 - 405. https://doi.org/10.1088/0143-0807/32/2/013. Retrieved from https://nsuworks.nova.edu/cnso_chemphys_facarticles/36