Is refractive index on each side of the parallelepiped the same?

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SUMMARY

The refractive index of a rectangular cube parallelepiped is not uniform across its sides; specifically, n1, n2, and n3 are not equal. The discussion clarifies that the refractive index pertains to the material of the object rather than its surfaces. In the case of an isotropic object in air, the refractive index of air is approximately 1, while the object's refractive index varies based on its material properties. Additionally, birefringent materials can exhibit different refractive indices depending on the light's path through them.

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Refractive index on each side of a rectangular cube parallelepiped: n1, n2, n3
Is this correct: n1=n2=n3?

http://image.bayimg.com/01c243801d8868097dbe98fb599b0d6aa9fb2e7d.jpg
 
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If n2 is the index of the rectangular object, then no.
 
Afair, the refractive index refers to a substance and not a surface. The picture appears to be of an isotropic object in air so all that's involved is the index of air (= nearly 1) and the index of the object material.
Is there some other definition that I don't know about or could you rephrase the question so that it makes sense to me please?
 
Any birefringence plate has tree side. we ha a birefringence plate with tree different side in size. The question is this: Is index of refraction of this birefringence plate related to the distance which light travels through it?! In other words, each side of this plate have a different refractive index or not?
 

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