The optic sign and optic angle can be determined together by combining interference pattern microscopy with use of a sensitive tint plate.
2.
The two right hand figures show the effect of adding a sensitive tint plate to the setup, replacing the grey at the centre with second order blue and first yellow birefringence colours.
3.
If the figure is aligned correctly, use of a sensitive tint plate in conjunction with the microscope allows the user to determine mineral " optic sign " and " optic angle ".
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