The geometrical properties of a planar harmonic mapping are stronglyinfluenced by the holomorphic part of the harmonic mapping in the open unitdisc D. The properties of the operator ψ[f](z) = f(z)+f′(z) − 1 for normalisedholomorphic functions in D are studied in this article. We calculate radius offully starlikeness and fully convexity of order α are related to ψ[f](z). We also study closure of certain subclasses of Harmonic functions under convexcombinations.