ABSTRACT
Light is a form of electromagnetic radiation. It is characterized by the electric field intensity E and the electric displacement vector D. These two vectors are related to the magnetic field intensity vector H and the magnetic flux density vector B by Maxwell’s equations:
∇ × H =
σE +
ε
∂E/
∂t (3.1a)
∇ × E = –
µ
∂H/
∂t (3.1b)
where
∇ is the vector operator [
∂/
∂x,
∂/
∂y,
∂/
∂z] and the constant
σ is electrical conductivity.
