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 tABbe the time for light to go from the point Ato the point Breflecting off the point P. Thus, tcLcLAB=+1112, where LxaLdxb122222=+=−+(). To find the path of
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