Interaction of Light (IMAGE) University of Extremadura Caption Interaction of light with a hollow sphere of silicon (A) and with the same sphere filled with a potion composed of three different strata (B). Credit UEx 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.