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Figure 4
Splitting of a light ray entering perpendicularly to the optical axis of a uniaxial medium. (a) The toothpick is the wave normal of the incident ray (and also that of the two refracted rays); the red arrows indicate the vibration directions of the refracted rays. (b) The blue arrows indicate the directions of the refracted rays (they coincide). (c) Another view of the model, where it is apparent that both rays are ordinary and they share the same trajectory though they travel at different speeds.

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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