=== Ray Reflection & Transmission ===
[[File:reflect.png|thumb|350px|The Incident, Reflected and Transmitted Rays at the Interface Between Two Dielectric Media]]
<!--[[File:frml6.png]]-->
=== Penetration Through Thin Walls Or Surfaces ===
[[File:thinwalltrans.png|thumb|350px|The Incident and Transmitted Rays through a Thin Wall]]
<!--[[File:frml21.png]]-->
=== Wedge Diffraction From Edges ===
[[File:diffract.png|thumb|350px|The Incident Ray and Diffract Ray Cone at the Edge of a Building]]