How can ellipticity angle be negative.

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.

DrDu Recognitions: Science Advisor	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.