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chp39_3 - PHY2061 R D Field Geometric Optics Fermat's...

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PHY2061 R. D. Field Department of Physics chp39_3.doc University of Florida Geometric Optics Fermat’s Principle: In traveling from one point to another, light follows the path that requires minimal time compared to the times from the other possible paths. Theory of Reflection: Let t AB be the time for light to go from the point A to the point B reflecting off the point P . Thus, t c L c L AB = + 1 1 1 2 , where L x a L d x b 1 2 2 2 2 2 = + = + ( ) . To find the path of
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