  We develop an amended ray optics description for reflection at the curved
dielectric interfaces of optical microresonators which improves the agreement
with wave optics by about one order of magnitude. The corrections are separated
into two contributions of similar magnitude, corresponding to ray displacement
in independent quantum phase space directions, which can be identified with
Fresnel filtering and the Goos-Haenchen shift, respectively. Hence we unify two
effects which only have been studied separately in the past.
