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Figure 11
Biaxial model. A toothpick has been used to indicate a wave normal parallel to one of the three principal sections (but not collinear with any axis). One of the refracted rays is ordinary (b) and its path coincides with the wave normal. The other one is extraordinary (c) and its direction has to be calculated as a conjugate direction.

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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