A Range of Simulated Rainbows (IMAGE) University of California - San Diego Caption From left: Rainbow based on the prevailing theory to simulate rainbows, primary rainbow with supernumerary bow, primary bow and double rainbow, primary bow with supernumerary bows and twinned rainbow, where the primary bow splits in two. Credit Iman Sadeghi/UC San Diego Jacobs School of Engineering Usage Restrictions Appropriate caption and credit required 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.