The range of validity of the Rayleigh and Thomson limits for Lorenz-Mie scattering

Abstract

The small-particle limit for scattering by spheres (Rayleigh scattering) has an upper limit on the refractive index. Also, the limiting expression for perfectly reflecting spheres has a lower limit on the refractive index. These limits are delineated here for both absorbing and nonabsorbing spheres.