HOW MUCH YOU NEED TO EXPECT YOU'LL PAY FOR A GOOD 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。Naturally, the higher the thickness or difference in refractive indices, the bigger the degree of retardation concerning waves. Early observations created on the mineral calcite indicated that thicker calcite crystals brought on greater va