Abstract
Plane-waves are the building blocks of arbitrary electromagnetic waves residing in homogeneous, linear media. A basic understanding of plane-wave properties and their behavior upon arrival at a flat interface between two such media is sufficient for the analysis of a number of interesting electrodynamic problems. This chapter presents several exemplary problems that are easy to set up and to describe, yet the understanding and appreciation of their full impact requires subtle arguments involving the properties of plane-waves and those of the Fresnel reflection and transmission coefficients. These examples reveal certain interesting as well as useful features of optical and electromagnetic systems that are frequently encountered in practical applications.