The 110 plane spacing of the conventional cubic cell is
(1)
For the first-order Bragg condition,
(2)
The quoted experimental deflection is twice the angle between the beam and the reflecting planes; reporting only would report the Bragg angle instead of the requested scattering angle. The 110 reflection is allowed for the identical-Fe body-centered lattice because is even. Wavelength and spacing have been expressed in the same units, so their ratio is dimensionless. Higher Bragg orders are conventionally represented by the corresponding higher-index reflection, rather than inserted as an unannounced extra order here.

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