Bragg's Law defines the fundamental mathematical relationship upon which X-ray crystallography measurement is based. Rosalind Franklin was an expert in X-ray crystallography and would've used Bragg's law to quantify the angle of scattering from an x-ray incident onto a crystal surface. This short tutorial explains the conceptual basis for Bragg's Law and provides a digital tool allowing students to use the equation to perform calculations.

Hyperphysics is a broad-ranging physics education site that features concept maps with flow charts for easy movement from one topic to a related one. The site is under continuing development by Rod Nave, PhD, Department of Physics and Astronomy, Georgia State University.