Hence the wave is not transmitted to medium 2, it gets reflected entirely from the interface to the medium 1.

& .................................(6.56)

Proceeding in the same manner for the magnetic field in region 1, we can show that,

...................................................................................(6.57)

The wave in medium 1 thus becomes a standing wave due to the super position of a forward travelling wave and a backward travelling wave. For a given ' t', both and vary sinusoidally with distance measured from z = 0. This is shown in figure 6.9.