Nicol prism

The Nicol Prism is an optical device that improved the method of polarizing light, allowing for the polarimetry technique to become practical. This prism could separate polarized light into two distinct planes, which was useful in studying the optical properties of various substances.
 William Nicol Scotland 1829 Nicol prism

The Nicol Prism is an optical device that improved the method of polarizing light, allowing for the polarimetry technique to become practical. This prism could separate polarized light into two distinct planes, which was useful in studying the optical properties of various substances.