Define Polarizer and Analyzer - QS Study

A device which produces plane polarized light is called a polarizer.

A device which is used to examine, whether light is plane polarized or not is an analyzer. A polarizer can serve as an analyzer and vice versa.

A ray of light is allowed to pass through an analyzer. If the intensity of the emergent light does not vary, when the analyzer is rotated, then the incident light is unpolarised; If the intensity of light varies between maximum and zero, when the analyzer is rotated through 900, then the incident light is plane polarized; If the intensity of light varies between maximum and minimum (not zero), when the analyzer is rotated through 90o, then the incident light is partially plane polarized.