(a) Scattering powers for a dilute solution of polystyrene spheres in D2O, collected for different values of scattering power in the range 0.028–3.13, obtained by varying the sample thickness and neutron wavelength. The values are determined from transmission measurements (open symbols) and the same values corrected for small-angle scattering in the direct beam (closed symbols), plotted against the theoretical value of the scattering power. The line follows τexp = τtheory. (b) Plots of SANS data from the solutions, normalized by the corrected transmissions presented in panel (a). The lines are calculated scattering patterns for spheres, including multiple scattering effects according to the theoretical values of the scattering power.