The figure below shows a beam of x-rays incident on the surface of a crystal. Although we often examine x-ray diffraction from planes containing atoms parallel to the surface of the material, it also occurs for any family of geometric planes that contain a large number of atoms. Consider x-rays reflecting off the Bragg planes shown in the figure. When x-rays with a wavelength of 0.169 nm are incident on the crystal at an angle of = 65.2 with respect to the surface, second order diffraction occurs for x-rays reflected off this family of Bragg planes. Determine the unit cell size a0