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).
The length of this ruler is twelve inches. The length of this ruler is twelve inches. The definition of length is how long something is, or the amount of vertical space or time it takes up.1  An example of length is two hours for a movie. 2  An example of length is 12 inches.he length of this ruler is twelve inches. The length of this ruler is twelve inches. The definition of length is how long something is, or the amount of vertical space or time it takes up.