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<p>or <a href="page.php?w=refraction">refraction</a> at the <a href="page.php?w=interface_%28chemistry%29">interface</a>s between media. Technical devices can therefore be employed to transmit or guide waves. Thus, an optical fiber or a copper cable is used as transmission media.</p>

<p><a href="page.php?w=Electromagnetic_radiation">Electromagnetic radiation</a> can be transmitted through an <a href="page.php?w=optical_medium">optical medium</a>, such as <a href="page.php?w=optical_fiber">optical fiber</a>, or through <a href="page.php?w=twisted_pair">twisted pair</a></p><p>
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