So, for example, when terms with formula_80 can be neglected (dipole approximation), formula_81, corresponds to the minimum in backscattering (magnetic and electric dipoles are equal in magnitude and are in phase, this is also called 'first Kerker' or 'zero-backward intensity condition'). And formula_82 corresponds to minimum in forward scattering, this is also called ‘second Kerker condition’ (or ‘near-zero forward intensity condition’). For the exact solution of the problem, it is necessary to take into account the contributions of all multipoles. The sum of the electric and magnetic dipoles forms Huygens source