Abstract the current work aims to study the rainbow like structure observed in the elastic scattering of alpha particles on 16O nuclei. We analyzed the experimental elastic scattering angular distributions data for α+16O nuclear system at energies 49.5, 69.5, 80.7 and 104 MeV. The data were analyzed using both optical potential and double folding potential of different interaction models such as: CDM3Y1, DDM3Y1, CDM3Y6 and BDM3Y1. Potential created by BDM3Y1 interaction model has the shallowest depth which reflects the necessity to use higher renormalization factor. Both optical model and double folding potential of different interaction models reasonably reproduce the experimental data. The obtained renormalization factor is nearly in the range 1.1157 - 1.3312.