Reflection and Refraction of Electromagnetic Radiation at a Two-phase Boundary

Reflection and Refraction of Electromagnetic Radiation at a Two-phase Boundary 

A planar electromagnetic wave (i.e., a wave with a fiat wavefront) that propagates along the x axis in vacuum can be described by a wave equation that expresses the electric field strength E at an arbitrary moment of time t and at a distance x from the origin  

The propagation of the electromagnetic wave in a condensed medium is described by 

The electromagnetic wave equation may then be written in a shorter form /2nn 

It is important to note that the convention that regards k as a positive number is used throughout this chapter. 

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