This defines the relation between the main different refractive indices of crystals.
UNIAXIAL.
Positive: n epsilon > n omega
Negative: n epsilon < n omega
BIAXIAL.
Positive:
n gamma - n beta > n beta - n alfa
ng is the acute bisectrix of the optic angle.
Negative
n gamma - n beta < n beta - n alfa
na is the acute bisectrix of the optic angle.
For simplicity the diagram, alfa, beta and gamma has been represented instead of n alfa, n beta and n gamma.
Por simplicación en la ffigura se ha puesto alfa, beta y gamma en vez de lo correcto n" alfa", "n beta" y "n gamma".
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