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).
Length. 1  Ald - the distance between a man's outstretched arms. 2  AssbÄ - Arabic finger. 3  Beard-second - the length a beard grows in a second.  Condylos - middle joint of 1  finger. Cun - width of the human thumb, at the knuckle.  Dactylos - Ancient Greek finger 1  breadth. Digit - length of a human finger Digitus - Ancient Roman 2  digit. Etzba - fingerbreadth.