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<p>resultant image.</p>

<p>Phase contrast is used extensively in optical microscopy, in both biological and geological sciences. In biology, it is employed in viewing <a href="page.php?w=staining">unstained</a> biological samples, making it possible to distinguish between structures that are of similar transparency or refractive indices.</p>

<p>In geology, phase contrast is exploited to highlight differences between mineral crystals cut to a standardised thin section (usually 30&nbsp;<a href="page.php?w=um">um</a>) and mounted under a light microscope.</p><p>
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