  The force of electromagnetic radiation on a dielectric medium may be derived
by a direct application of the Lorentz law of classical electrodynamics. While
the light's electric field acts upon the (induced) bound charges in the medium,
its magnetic field exerts a force on the bound currents. We use the example of
a wedge-shaped solid dielectric, immersed in a transparent liquid and
illuminated at Brewster's angle, to demonstrate that the linear momentum of the
electromagnetic field within dielectrics has neither the Minkowski nor the
Abraham form; rather, the correct expression for momentum density has equal
contributions from both. The time rate of change of the incident momentum thus
expressed is equal to the force exerted on the wedge plus that experienced by
the surrounding liquid.
