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<p>elements. <a href="page.php?w=Optics">Optics</a> is the study of how to manipulate optical radiation.  </p>

<p><big> Sources </big></p>
<p>Optical radiation may be divided into two types:;Artificial optical radiation: Artificial optical radiation is produced by artificial sources, including <a href="page.php?w=Coherence_%28physics%29">coherent</a> sources such as <a href="page.php?w=laser">laser</a>s and incoherent sources such as <a href="page.php?w=UV_lamp">UV light</a>s, common <a href="page.php?w=light_bulb">light bulb</a>s, <a href="page.php?w=radiant_heater">radiant heater</a>s,</p><p>
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