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vera overhead | by Paul Cowell
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vera overhead

Snell's window is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees.[1] This phenomenon is caused by refraction of light entering water, and is governed by Snell's Law.[2] The area outside Snell's window will either be completely dark or will show a reflection of under-water objects.

Underwater photographers sometimes compose photographs from below such that their subjects fall inside Snell's window, which backlights and focuses attention on the subjects.

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Taken on March 18, 2012