The relation between inter planer spacing(d), lattice parameter and miller indices (hkl)
A. $$n\lambda d = \frac{a}{{\sqrt {{h^2} + {k^2} + {l^2}} }}$$
B. $$\lambda = \frac{d}{{a\sqrt {{h^2} + {k^2} + {l^2}} }}$$
C. $$d = \frac{a}{{\sqrt {{h^2} + {k^2} + {l^2}} }}$$
D. None of these
Answer: Option C
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