Birefringence: the marvel of light being polarized

Since I didn’t payed enough attention to school hours now I’m happy to simply learnt he same things over and over again. In this simple explanation we can see why the light bends when it’s traveling through a transparent material and why we see two images when we use special cristals.

Professor Mike Merrifield explains what birefringence is: using special cristals (like calcite cristals ) to show two images of the same object. That happens because the images are formed due to the double polarization of the light (the light waves wiggles on two different directions) . That does not happen with each transparent material, but it is indeed an interesting phenomenon.

You also might want to know why the glass is transparent.

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