The skin - depth of copper at a frequency of $$3 GHz$$ is $$1$$ micron ($${{{10}^{ - 6}}}$$ metre). At $$12 GHz$$, for a non - magnetic conductor whose conductivity is $$1/9$$ times that of copper, the skin $$-$$ depth would be

In a good conductor the phase relation between the tangential components of electric field E_t and the magnetic field H_t is as follows

For an electromagnetic wave incident from one medium to a second medium, total reflection takes place when