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Yes, an object standing responsible for polarization can have two refractive indices. For example, calcite is a bireferingent material which splits up a plane polarised light into an e ray (one which doesnt obey Snell's law) and an o ray (one which obeys Snell's law) once incident on its surface. Since the velocity of both the rays will be different, there ...


This might be different from what you have, but I have seen this effect on diffraction grating glasses. The shadow images that I see are because different wavelengths are bent at different angles by the diffraction grating. Because of this, on a computer I get major red, blue and green images, with some minor images further away from the centre. ...

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