Determination of unit normal vectors of aspherical surfaces given unit directional vectors of incoming and outgoing rays: comment
Antonı́n Mikš, Pavel Novák · Journal of the Optical Society of America A · 2012
In a recent paper by Lin and Tsai [J. Opt. Soc. Am. A 29, 174 (2012)] there is presented a rather complicated method for derivation of the unit normal vectors of an aspherical surface given the knowledge of the unit directional vectors of the incoming and outgoing rays. In our comment we present a much simpler method that leads to compact equations suitable for practical implementation.