The PT-symmetric optical grating with index profile e2ibz has been shown to have the interesting
property of being essentially invisible for light incident from one side, while possessing greatly
enhanced reflection at a particular wavelength for light incident from the other side. We extend a
previous analysis of this grating to obtain an analytic solution for the case when the grating is
embedded on a substrate, with different refractive indices on either side. We also generalize the
previous case of normal incidence to incidence at an arbitrary angle. In that case the enhanced
reflection occurs at a particular angle of incidence for a given wavelength. Finally we discuss
how the grating may be used to give lasing.