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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html><head>
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<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type"><title>Focal Length</title></head>
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<body>
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<h1><a name="Focal_Length"></a>Focal Length</h1>
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Focal
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length is the measure of how strongly an optical system can converge or
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diverge light – It is the distance over which rays can be brought to
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focus. Shorter the focal length, higher the optical power and
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magnification.<br>
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<br>
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Long focal length enables focusing on a distant object but narrows down
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the angle of view.<br>
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<br>
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<img alt="" src="image/35mm.jpg" border="0">
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<img alt="" src="image/100mm.jpg" border="0">
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<img alt="" src="image/400mm.jpg" border="0">
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<img alt="" src="image/1200mm.jpg" border="0"><br></body></html>
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