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30.0 MB (30.0 MB compressed)
3500 x 3000 pixels
29.7 x 25.4 cm ⏐ 11.7 x 10.0 in (300dpi)
DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Refraction. Computer artwork showing the refraction of light beams through a biconcave lens. Light changes direction, or is refracted, when it meets a different transparent medium such as a lens. A biconcave lens causes light beams to diverge. It is used to correct myopia (short- sightedness), a condition in which light is focused before it reaches the retina.
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