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Figure 3
By applying the geometrical constraints for constructive inter­ference introduced in Fig. 2[link]a, it can be shown that increasing the wavelength (at the scale of the triangular ruler) leads to an increase in the Bragg angle θ (the values given here for θ were measured using a triangular ruler). Note that the limit for diffraction is reached at θ = 90°, when λ/2 becomes the same as the lattice spacing. Any wavelength larger than λ/2 means that the edges of the ruler cannot be aligned with the anchor points on the lattice planes. For a real diffraction experiment, this implies that no d-spacing smaller than λ/2 can be determined, which ultimately affects the resolution of the data (see main text).

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 81| Part 12| December 2025| Pages 1195-1199
https://doi.org/10.1107/S2056989025010576
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