If the immersion medium is changed, the relief will also change


When a mineral is immersed in liquids with a different refractive index, its relief will change even if it remains in the same position.

This means that the value of its refractive index can be determined when it has the same directions of vibration as the polariser, as this value will be the same as that of the immersion medium in which the relief is neutral or nil (4).



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