Optical Properties of Large Fogdrops in the Geometrical Optics Approximation

A geometrical optics approximation method for sphere (called Gom) is developed to compute its absorption and scattering cross sections. And it is applied to calculate absorption coefficients, scattering coefficients and phase function of electromagnetic radiation by large fogdrops. The shapes of fogdrops are assumed to be spherical. Comparison between the results which are computed by using Mie code, Monte Carlo code and Gom separately indicates that the agreement is good. The optical properties research of fogdrops is benefit for further research as obscurant.