RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Straight wave refraction. Artwork showing straight waves passing from one medium (top) into a denser medium (bottom). The refracted waves (blue) travel in the same direction, but at a different angle, to the incident waves. The waves travel more slowly in the denser medium, so the angle at which they travel becomes more perpendicular to the border between the two media.
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