Wood Sawdust with Pores
The cellulose fibrils are oriented tangentially in the structure of the pore. As a result the high
refractive index is tangential. When the red plate compensator is added to the path the NE and SW
quadrents turn yellow and the NW and SE quadrents turn blue.
Transmitted Crossed Polarized Light with Red Plate Compensator
Significance in the Environment: