Abstract
We examine the ideas about the exchange term and the effect of odd forces in the calculation of the nucleon-nucleus optical potential using a folding and a density and energy effective interaction. When only even forces are considered, the real exchange term is repulsive at the nuclear centre while at the surface it is attractive for low energies and becoming repulsive as the incident energy increases. The presence of the odd interactions alters the strength of the potential but does not affect substantially the r.m.s. radius.
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