Optics Optical isotropy means having the same optical properties in all directions. The individual reflectance or transmittance of the domains is averaged for micro-heterogeneous samples if the macroscopic reflectance or transmittance is to be calculated. This can be verified simply by investigating, for example, a polycrystalline material under a polarizing microscope having the polarizers crossed: If the crystallites are larger than the resolution limit, they will be visible.
Optics Optical isotropy means having the same optical properties in all directions The individual reflectance or transmittance of the domains is averaged for micro-heterogeneous samples if the macroscopic reflectance or transmittance is to be calculated This can be verified simply by investigating for example a polycrystalline material under a polarizing microscope having the polarizers crossed If the crystallites are larger than the resolution limit they will be visible