Here are two very nice Articles about "Reflections" in the real world and how to simulate them in computer graphics. The first Article deals with photons and techniques in cg to simulate their behaviour. The second Article deals with BRDF's (and other models to describe materials). Not very complicated to read but very informative!
(link taken from cgarchitect)
The world of reflections - Part I
The world of reflections - Part II
(link taken from cgarchitect)
The world of reflections - Part I
The world of reflections - Part II
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