Bragg’s Equation

Braggs Equation

Crystal structures are studied by x-ray diffraction method.

It is due to the interatomic differences and interplanar distances in a crystal are in the range of wavelength of x-rays.

Only in the case of x-rays diffraction is possible.

Path difference = BC + CD

= AC sinθ + AC sinθ

= d sinθ + d sinθ

= 2d sinθ

According to the Bragg’s

Path Difference α λ

2d sinθ α λ


2d sinθ = nλ

d = distance between atomic layers