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Figure 6
Graphical procedure to obtain the direction of the extraordinary ray in a uniaxial medium. A half-ellipsoid (a) can be used to draw on a sheet of paper (b) the ellipse, where the vibration direction can be used to calculate the direction of the ray (i.e. the conjugate direction). A blue arrow (c) has been stuck on the section of the model and small stickers indicate the vibration direction of this extraordinary ray.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 51| Part 3| June 2018| Pages 901-908
https://doi.org/10.1107/S1600576718003709
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