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).
A short dictionary definition for length is the longest dimension of something that is fixed in space. Therefore, with a 2-dimensional rectangle, when the sides are not labeled, and no other instructions are given, the LENGTH of the figure is ALWAYS going to be the LONGEST side, while the width is the shorter side.f 50 inches is the perimeter all you can say is that length plus width = 25 inches.