  The tangent vector of the light trajectory at future infinity and the angle
of total light deflection in the gravitational field of an isolated
axisymmetric body at rest with full set of mass-multipoles and spin-multipoles
is determined in harmonic coordinates in the 1PN and 1.5PN approximation of the
post-Newtonian (PN) scheme. It is found that the evaluation of the tangent
vector and of the angle of total light deflection caused by mass-multipoles and
spin-multipoles leads directly and in a compelling way to Chebyshev polynomials
of first and second kind, respectively. This fact allows to determine the upper
limits of the total light deflection, which are strictly valid in the 1PN and
1.5PN approximation. They represent a criterion to identify those multipoles
which contribute significantly to the total light deflection for a given
astrometric accuracy. These upper limits are used to determine the total light
deflection in the gravitational field of the Sun and giant planets of the solar
system. It is found that the first few mass-multipoles with l \le 10 and the
first few spin-multipoles with l \le 3 are sufficient for an accuracy on the
nano-arcsecond level in astrometric angular measurements.
