refraction of light in water

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From: Camilla Lau (camillaklau@hotmail.com)
Date: Thu May 01 2003 - 10:19:11 PDT 

From: "Camilla Lau" <camillaklau@hotmail.com>
Subject: refraction of light in water
Date: Thu, 01 May 2003 17:19:11 +0000
Message-ID: <Law8-F86US84zr4T9EV0000f300@hotmail.com>

I think I understand the basic reason why a fish in water appears to be
closer to the surface due to refraction of light. However, when your brain
assumes the refracted ray traveled along a straight line path from inside
the water to reach you, how does it know how far back to trace that line?
How do we know how far back to trace it in a diagram? Thanks!

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