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).
(wÉªdÎ¸) n. 1. the linear extent or measurement of something from side to side, usually being the shortest dimension or (for something fixed) the shortest horizontal dimension. 2. the state or fact of being wide. 3. a piece or section of something at its full extent from side to side: a width of cloth. 4. (Swimming, Water Sports & Surfing) the distance across a rectangular swimming bath, as opposed to its length. [C17: from wide + -th1, analogous to breadth]