Polarimetry Use monochromatic light,usually sodium D Movable polarizing filter to measure angle Clockwise dextrorotatory d or (+ Counterclockwise levorotatory =/or (- Not related to (R)and (S) +50-5 sodium monochromator polarizing sample cell analyzing detector lamp filter filter filter => Chapter 5 12Chapter 5 12 Polarimetry • Use monochromatic light, usually sodium D • Movable polarizing filter to measure angle • Clockwise = dextrorotatory = d or (+) • Counterclockwise = levorotatory = l or (-) • Not related to (R) and (S) =>