For FCC iron, calculate the diffraction angle for the (220) set of planes. The lattice parameter for  Fe is 0.3571 nm. Assume that monochromatic radiation having a wavelength of 0.1540 nm is  used, and the order of reflection is 1.

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The Space Lattice and Unit Cells

Every matter consists of atoms, molecules, and ions. If these atoms, molecules, and ions (micro-particles) are represented in a three-dimensional space-occupying certain specific points in space, then these arrangements are termed as space lattices and the specific points which are being occupied by atoms, molecules and ions are termed as lattice points. The atoms, molecules, and ions at the lattice points are generally grouped in a regular fashion and repeat periodically at the three-dimensional space.