DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Refraction. Computer artwork showing the refraction of light beams through a biconvex lens. Light changes direction, or is refracted, when it meets a different transparent medium such as a lens. A biconvex lens causes light beams to converge. It is used to correct hypermetropia (long-sightedness), a condition in which light is focused behind the retina.
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