Using identities for time derivatives and del operators, show
that the solution of the inhomogeneous wave equation for the
potential V given by the Lorentz gauge (the expression containing
an integral over volume), does indeed satisfy the inhomogeneous
wave equation.
1).a) Show that the bound state wave function ψb (Eqn 2.129) and
the continuum state wave
function ψk (Eqn 2.131-132 with coefficients 2.136-137) are
orthogonal, i.e., 〈ψb|ψk〉 = 0. (b)
[bonus] Explain why the orthogonality exists, example as, are they
eigenstates of an operator? If so,
what is the operator? If not explain.
Using the method of jones calculus show that the effect of a
half wave plate on a circularly polarised state is to turn it into
another circular state of the opposite handedness