Focused Waves (IMAGE) University of Michigan Caption Picture is a color-coded plot of the electromagnetic field. The device, or plate, is at the left edge of the picture. Focusing is clearly seen at the horizontal axis value of seven. Credit Roberto Merlin 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.