49.5 MB (10.4 MB compressed)
5307 x 3258 pixels
45.0 x 27.7 cm ⏐ 17.7 x 10.9 in (300dpi)
ER DEGGINGER / SCIENCE PHOTO LIBRARY ER DEGGINGER / SCIENCE PHOTO LIBRARY
Light beams refracting in a lens causing them to converge. 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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