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A polarimeter.

Operating principle of an optical polarimeter. 1. Light source 2. Unpolarized light 3. Linear polarizer 4. Linearly polarized light 5. Sample tube containing chiral molecules under study 6. Optical rotation due to molecules 7. Rotatable linear analyzer 8. Detector

A polarimeter.

Redraw of https://en.wikipedia.org/wiki/File:Half*shade.jpg

A polarimeter.

Modern automatic polarimeter with touchscreen and camera image of filled sample cell.