Interference colour. How is it formed?
The interference colour is a very important property, but
its explanation is extremely complex. We shall therefore gradually develop
its basic concepts.
2 polariser + isotropic mineral + analyser
3 polariser + anisotropic mineral + analyser (position perpendicular to the optic axis)
4 polariser + anisotropic mineral + analyser. Specific position: extinction position
5 polariser + anisotropic mineral + analyser. General position: interference colour
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