Massive Photons 1 (IMAGE) University of Warsaw, Faculty of Physics Caption The dependence of the energy (vertical axis) on the angle for polarized light reflected from birefringent optical cavity (horizontal axis). (Source: M. Krol, UW Physics) Credit Source: M. Krol, UW Physics) Usage Restrictions The image may only be used with the following caption: The dependence of the energy (vertical axis) on the angle for polarized light reflected from birefringent optical cavity (horizontal axis). (Source: M. Krol, UW Physics) 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.