The wave that results from the interaction of the plane wave with the lattice then has the form ei→k⋅→r−iωtg(→r), This subset is the set of lattice points that lie...The wave that results from the interaction of the plane wave with the lattice then has the form ei→k⋅→r−iωtg(→r), This subset is the set of lattice points that lie in the plane, →d⋅→r=1, that is parallel to the plane →d⋅→r=0, in the lattice.