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<p>of <a href="page.php?w=rock_%28geology%29">rocks</a> easier, in particular by allowing deduction of the shape and orientation of the <a href="page.php?w=optical_indicatrix">optical indicatrices</a> within the visible crystal sections. This alignment can allow discrimination between minerals which otherwise appear very similar in plane polarized and cross polarized light.</p>

<p><big> Principles of operation </big></p>
<p><a href="page.php?w=Image%3AOptical-waveplate-1inch.jpg">thumb</a>A waveplate works by shifting the <a href="page.php?w=phase_%28waves%29">phase</a></p><p>
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