How Do You Use A Polarimeter?
A polarimeter determines the angle of optical rotation of polarized light as it passes through some material. Optical rotation is the process of turning the plane of polarized light about the direction of motion. The light waves of unpolarized light oscillate in all directions, while the waves of polarized light only oscillate in one direction. Solutions of certain types of substances such as sugar can polarize light; solid crystals may also be effective polarizers. Select a light source. This may be a direct light source such as a light bulb, neon sign or TV screen, or an indirect light source such as a mirror or cloud. Set the polarimeter to zero degrees and view the selected object through the polarimeter. Rotate the lens of the polarimeter filter slowly until you have rotated it in a complete circle. Check for any changes in brightness. The light is unpolarized if its brightness does not change as you rotate the lens. Locate the polarimeter setting at which the light is brightest.
