Is the polarimeter a physical or chemical instrument or an optical ray instrument?

Is the polarimeter a physical or chemical instrument or an optical ray instrument?

Metal oxides are compounds formed by the association of metal elements with oxygen. All metals, including platinum and gold, have corresponding metal oxides.

Iron oxide (Fe2O3) commonly known as iron oxide red, as red pigment; some industrial process applications and is also a catalyst of metal oxide.

Metal oxides are widely used in daily life. Quicklime is a common drying agent and can also be used for disinfection;