A polarizer or polariser is an optical filter that lets light of a specific polarization pass and blocks waves of other polarizations. It can convert a beam of light of undefined or mixed polarization into a beam of well-defined polarization, that is polarized light. The common types of polarizers are linear polarizers and circular polarizers.
Length is a measure of one dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed).In most systems of measurement, the unit of length is a base unit, from which other units are defined.ength is a measure of one dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed).
Definition of thickness. 1 : the smallest of three dimensions length, width, and thickness. 2 : the quality or state of being thick. 3a : viscous consistency boiled to the thickness of honeyb : the condition of being smoky, foul, or foggy. 4 : the thick part of something. 5 : concentration, density.