An EM wave incident upon a flat medium is normally reflected with the amount of intensity prescribed by the Fresnel equations. However, this should be modified in the presence of a properly modulated strong interface-traveling light wave.
Schnieders, D. (2011). Light source estimation from spherical reflections [doctoral dissertation, The University of Hong Kong]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0029-1812201200018823