Optic sing

 

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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