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Bragg's Law For Diffraction

$\LARGE 2d\sin\theta = n\lambda$

The Terms

$d$ - Spacing between planes in the atomic lattice [Units: m]

$\theta$ - Angle between the incident wave and the scattering planes

$n$ - An integer determined by the order

$\lambda$ - Wavelength of the incident wave [Units: m]

What Does It Mean

In crystallography, this equation is used to find the angles of coherent and incoherent scattering off a crystal lattice. For direction in which the above equation is satisfied, waves scattered from atomic planes separated by a distance $d$ interfere constructively and produce maxima on the diffraction pattern.

Further information at Warwick

Bragg's Law of Diffraction is covered in the third year module "PX393 Crystal Physics".