View Single Post
P: 3,883
 Quote by DrDu I don't see what is the problem with a negative ellipticity angle. The sign of the arcus tangens is not fixed by it's argument, it can be either positive or negative. To decide which one to choose, you have to look at the polarisation of the wave.
The question is how to draw a negative ellipticity angle physically?
$$\chi\;=\;\tan^{-1} \frac {a_{\eta}}{a_{\epsilon}}$$
Both are just length and is never negative.