Translations:Reflection and refraction – book/1/en

We now consider phenomena related to the propagation of waves through real media. In particular, we shall study the characteristics of waves as they progress through various materials, crossing interfaces and being reflected and refracted in the process. Many of the basic concepts of wave motion, although they are predicated on the phenomenon’s wave aspects, nevertheless are independent of the exact nature of the wave. As we shall see, the most important such concept is again Huygens’ principle.