thus it is:
2) |
and the phase change at wavelength , is given by:
3) |
This formula is also to be applied in our case, it must only be considered that the direction of the translatory velocity (tangent)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/WitteSagnac6.png/400px-WitteSagnac6.png)
and that of light (polygon side) do not coincide, it is thus (as it follows from Fig. 2) substituted instead of :
where denotes the polygon side of the corresponding central-angle.
If one substitutes this value, than the phase difference , mutually experienced by rays and due to the relative aether stream, is:
4) |
Finally one can substitute value 1) for velocity of the relative aether stream with rotating number and circle radius , then it is given: