  Quasiclassical approach and geometric optics allow to describe rather
accurately whispering gallery modes in convex axisymmetric bodies. Using this
approach we obtain practical formulas for the calculation of eigenfrequencies
and radiative Q-factors in dielectrical spheroid and compare them with the
known solutions for the particular cases and with numerical calculations. We
show how geometrical interpretation allows expansion of the method on arbitrary
shaped axisymmetric bodies.
