We derive an elementary relation for the determination of the pseudo-B
rewster angle of metals as a function of frequency. The pseudo-Brewste
r angle is defined as the angle where the reflection is minimal, i.e.,
the absorption is maximal. A comparison of the approximated values wi
th the exact ones shows that the former are very accurate for photon e
nergies below the Drude plasma frequency. Additionally we give two ver
y simple expressions for a fast and surprisingly good estimate at low
and high photon energies. (C) 1995 American Institute of Physics.