The analysis of the elastic scattering of Li-6 by C-12 at the lab energies 30.6, 59.8, 90, 99, 156, 210 and 318 MeV and by C-13,C-14 at 93 MeV have been carried out in the frame of the semimicroscopic approach accounting for dispersion relations. It indicates the abnormal dispersion behaviour at energies near 15 MeV/nucl.