The region of validity of the single‐scattering approximation used in Part I is found by considering the next higher approximation; it is valid fork02arα2≪1, wherek0is the wave number of the incident sound,ris the range from source to observer,ais the mean size of the inhomogeneities, and α is the rms value of the refractive index variations. Some approximate results are given for the case of wavelength large compared with inhomogeneity size. By consideration of the intensity variations, it is found that ray theory is valid for (k0a2/r)≫1, as has been found for plane waves.