Refraction
When an RF signal meets the boundary between media of two different densities, it can also be refracted. Think of reflection as bouncing off a surface and refraction as being bent while passing through a surface.
A refracted signal will have a different angle from the original, as illustrated in Figure 3-12. The speed of the wave can also be affected as it passes through the different materials. A signal can be refracted when it passes through layers of air having different densities or through building walls with different densities, for example.
Figure 3-12 Refraction of an RF Signal.
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