Measuring with dispersed laser beam (IMAGE) GFZ Helmholtz-Zentrum für Geoforschung Caption By measuring the dispersed laser beam the scientists were able to get the refractive index of SiO2 glass and also key information to quantify its density. Credit Sergey Lobanov Usage Restrictions none License Original 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.