EVERYTHING ABOUT BIREFRINGENT CRYSTAL

各向异性透明晶体如方解石、石英等的折射率，是其固有的特性，称为永久双折射。In Just about every body of Figure 8, the axis with the microscope polarizer is indicated through the cash letter P which is oriented within an East-West (horizontal) course. The axis of the microscope analyzer is indicated with the letter