Fresnel's Law and Phase Relationship Between Reflected and Incident Light ZHANG Kun-shu 1,LIANG Er-jun 2(1 Teaching Department of Fundamental Science, Pingdingshan Industrial College, Pingdingshan 467001, China;2 School of Physical Science and Engineering, Zhengzhou University, Zhengzhou 450052, China)From the derivation of Fresnel's law, an one-to-one correspondence between the phase and orientation of the electric field of the reflected light was built up. Positive or negative values of the amplitude reflectivity r_ px and r_ py gave rise to the real phase and orientation of the reflected filed relative to the incident one.Fresnel's law; phase mutation; electric filed orientation