This thus became known as the " extraordinary ray ".
2.
The refractive index of the extraordinary ray varies depending on its direction.
3.
These rays with differing refractive indices are known as the ordinary and extraordinary rays.
4.
Introduces a path difference of A / 2 between ordinary and extraordinary ray.
5.
The refractive index for Canada balsam is in between the refractive index for the ordinary and extraordinary rays.
6.
However the extraordinary ray, as its name suggests, propagates unlike any wave in a homogenous optical material.
7.
In the first case, both polarizations see the same effective refractive index, so there is no extraordinary ray.
8.
In the second case the extraordinary ray propagates at a different phase velocity ( corresponding to " n " e ) but is not an inhomogeneous wave.
9.
In terms of its optical properties, sweetite has two indices of refraction, 1.635 along the ordinary ray and 1.628 along the extraordinary ray.
10.
Rotating the calcite crystal will cause one of the two images, that of the extraordinary ray, to rotate slightly around that of the ordinary ray, which remains fixed.
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