what is the apex angle of the conical region through which a person in water views the outside object?
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Snell's window (also called Snell's circle or optical man-hole) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. This phenomenon is caused by refraction of light entering water, and is governed by Snell's Law.
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beyond 90 may be
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