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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 ...


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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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