The dependences of the angular distribution of the scattered energy on the
particle size and refractive index and on the phase shift (Delta) were stud
ied. It was shown, in particular, that in the hypsometric plane for Delta g
reater than or equal to 3, the light-scattering indicatrix F calculated by
the Mie theory is determined by two factors: the Fraunhofer diffraction and
geometrical optics. The possibility of measuring the refractive index from
the experimental values of the aperture angle of a photodetector at fixed
values of F was also considered. (C) 2000 MAIK "Nauka/Interperiodica".