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<p><a href="page.php?w=ray_%28optics%29">rays</a>.</p>

<p><big>Overview</big></p>
<p>With an ideal <a href="page.php?w=Lens_%28optics%29">lens</a>, light from any given point on an object would pass through the lens and come together at a single point in the image plane (or, more generally, the image surface). Real lenses, even when they are perfectly made, do not however focus light exactly to a single point. These deviations from the idealized lens performance are called aberrations of the lens.</p>

<p>Aberrations fall into two classes: monochromatic</p><p>
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