Bragg's law describes the angles for coherent and incoherent scattering from a crystal lattice when exposed to X-rays or neutron waves. It was first proposed by William Lawrence Bragg and William Henry Bragg in 1913 to explain the diffraction patterns produced when X-rays hit crystalline solids. Bragg's law states that constructive interference, and thus diffraction, occurs when the path length difference between scattered waves is an integer multiple of the wavelength. This relationship is given by the equation nλ = 2d sinθ, where n is an integer, λ is the wavelength, d is the spacing between crystal planes, and θ is the scattering angle. Bragg's law provided a powerful tool for determining crystal structures using techniques like X-ray crystal