Integral light-scattering indicatrix of optically soft spherical particles

The dependences of the angular distribution of the scattered energy on the particle size and refractive index and on the phase shift (Δ) were studied. It was shown, in particular, that in the hypsometric plane for Δ≥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.