Lab Work • Comprehensive study of a mica blade

We propose here to fully determine a mica sheet without having precise information beforehand about its thickness or its optical index. First, it is necessary to carry out two measurements exploiting the interferences obtained by reflection at 45° on a mica sheet to determine its thickness e and its index n. Then, using the experimental measurement of the thickness e of the sheet, you can deduce the birefringence of this mica sheet.