The following show electric field of polarized light.
E_x(t)=E_{xo} cos(\omega t)
E_y(t)=E_{yo} cos(\omega t+\theta)

You can use sliders to change E_{xo},E_{yo} and \theta

If E_{xo}=E_{yo} and \theta=0, it is a linear wave.
If E_{xo}=E_{yo} and \theta=\pi/2, it is a circular polarized wave.
If E_{xo}\ne E_{yo} it is an ellipse polarized wave.

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