The polarisation plane of a wave (IMAGE) St. Petersburg State University Caption The polarisation plane of a wave is the plane in which a vector (for example, the electric field vector) oscillates and changes. In the figure, the oscillations of the electric vector are in blue; the polarisation plane is in red. Credit SPbU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.