Fresnel explained the phenomenon optical rotation as light propagates at different speeds with R and L circular birefringence.
For the experimental verification he made a composite prism consisted of three quartz prisms.
The central prism was made of left-handed quartz, while the two edged of right-handed quartz.
We have managed to carry out the experiment with a similar composite quartz prism. The main complexity is that the light propagate against ‘circular birefringence’ is very little, because the relative refraction index is only ?n=0.00007. That is why we used a telescopic tube with 20-fold angular magnification in order to increase the space between two images, and amounted the setup with large distances between the elements.