Refraction of incident light rays by glass block, illustration
Illustration showing the refraction of different colours (ROYGBIV) of light rays by a tilted glass block. As a result of refraction, the rays emerge parallel to their original direction, because the parallel faces of the block reverse the directional shift. When the block is perfectly aligned at right angles to the beams, they pass through without any deflection., by RUSSELL KIGHTLEY/SCIENCE PHOTO LIBRARY
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