In this study, we investigate electromagnetic field and Chaplygin gas in f(R) - gravity. We use field equations and their solutions of spherically symmetric space-time in the presence of conformal symmetry. Exact solutions of conformal spherically symmetric Chaplygin gas and electromagnetic field are obtained to the accompaniment of important results. Obtained f (R) function is classified with viable f (R) models of the modified theory. Also, we have discussed geometrical and physical features of the obtained solutions.