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Normal Incidence

In case of a plane wave in air incident normally upon the surface of the conducting medium, the wave is entirely reflected. For a field that varies with time, neither Description: 24608.png nor Description: 24764.png will exist within the conductor. As there is no loss within a perfect conductor, there is no absorption of energy.

Oblique Incidence

When a wave is incident obliquely at a conducting surface, two cases may arise:
  1. Horizontal Polarisation
     
    In this case, the electric field is parallel to the boundary surface or perpendicular to the plane of incidence. The plane of incidence is the plane containing the incident ray and the normal to the surface.
Description: 32308.png
Horizontal polarisation for a conducting surface
  1. Vertical Polarisation
     
    In this case, the magnetic field is parallel to the boundary surface and electric field is parallel to the plane of incidence.
     
    Ei and Er will have the directions as shown in the figure because the components parallel to the perfectly conducting boundary must be equal and opposite.
Description: 32410.png
Vertical polarisation for conducting surface





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