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<p>the idea that <a href="page.php?w=visual_perception">visual perception</a> is accomplished by rays emitted by the eyes. He also commented on the <a href="page.php?w=parity_%28physics%29">parity</a> reversal of mirrors in <a href="page.php?w=Timaeus_%28dialogue%29">Timaeus</a>. Some hundred years later, <a href="page.php?w=Euclid">Euclid</a> (4th-3rd century BC) wrote a treatise entitled <a href="page.php?w=Euclid">Optics</a> where he linked vision to <a href="page.php?w=geometry">geometry</a>, creating geometrical optics. He based his work on</p><p>
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