Polarisation meaning in Physics

Microscope Anatomy & Function Condenser Page 4 of 4 The condenser has an iris diaphragm that controls the angle of the beam of light focused onto the specimen.  The iris diaphram is an adjustable shutter which allows you to adjust the amount of light passing through the condenser.  The angle determines the Numerical Aperture (NA) of the condenser. This diaphragm, generally called the aperture diaphragm, is one of the most important controls on the microscope. Back to Microscope  Previous Page

This diaphragm, generally called the aperture diaphragm, is one of the most important controls on the microscope.

electric polarization, slight relative shift of positive and negative electric charge in opposite directions within an insulator, or dielectric, induced by an external electric field. Polarization occurs when an electric field distorts the negative cloud of electrons around positive atomic nuclei in a direction opposite the field. This slight separation of charge makes one side of the atom somewhat positive and the opposite side somewhat negative. In some materials whose molecules are permanently polarized by chemical forces, such as water molecules, some of the polarization is caused by molecules rotating into the same alignment under the influence of the electric field. One of the measures of polarization is electric dipole moment, which equals the distance between the slightly shifted centres of positive and negative charge multiplied by the amount of one of the charges. Polarization P in its quantitative meaning is the amount of dipole moment p per unit volume V of a polarized material, P = p/V.