A diffraction study of a cubic system with Cu K radiation ( = 0.154 nm) offered the interplanar spacing of a plane, d110 = 2.22

 A diffraction study of a cubic system with Cu Kα radiation (λ = 0.154 nm) offered the interplanar spacing of a plane, d110 = 2.22 nm. Find out the interplanar spacing of the plane (220), with the aid of an appropriate equation.