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yy.toh

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thus d=n.lambda/2 sin theta=1/{h^2/a^2+k^2/b^2+l^2/c^2}

lambda and theta are given.

Look, there are two types/sets of unknowns in the d formula, they are miller indices h, k, l and lattice constant a, b, c. Normally the x-ray diffractometer analysis would give the significant theta according to the count, and also the h, k l and a, b, c. Now I wonder what method the machine has used to figure out the h, k, l and a, b, c?there are two sets of unknown remember?how it is solved by using only one equation?

Looking forward for experts answers...

thanks