Bragg’s law is used in X-ray crystallography to determine the crystal structure of materials. It relates the angle of incidence (glancing angle) of X-rays on a crystal lattice to the spacing between the crystal planes. By measuring the angles at which X-rays are diffracted we can determine the spacing between the planes of atoms in a crystal lattice, which helps to elucidate its structure. This information is crucial for understanding the arrangement of atoms within the crystal lattice and can provide insight into various properties and behavior of the material.