Hello everybody, I would like to put a quarter wave plate in my microscope (between two crossed polarizers). In every book i saw so far, the plate was just before the upper polarizer, and after the specimen. my question is - can i put the plate before the specimen? so the path will be : light source, polarizer, plate, specimen, polarizer. note: my specimen is birefringence object. the way i see it, phase differences are added together, so is there a problem? Thanks! Hanan.