International
Tables for Crystallography Volume C Mathematical, physical and chemical tables Edited by E. Prince © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. C, ch. 5.4, p. 537
Figure 5.4.1.1
A. W. S. Johnson^{a}


Figure 5.4.1.1
Diffraction geometry. Crystal at C with the direct transmitted beam, CRO, intersecting the reciprocallattice origin at R and the recording plane at normal incidence at O. The camera length L is CO and the reciprocal of the wavelength λ is CR. 