Question

Show that the cell form factor of the FCC lattice is: If h, k, l are...

Show that the cell form factor of the FCC lattice is:
If h, k, l are partly even or odd, the summation is 0.
If h, k, l are all even or all odd, summation is 4f.

As usual, we mean hkl referred to the cubic conventional cell.

(Please explain all steps)

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