POLARIZATION

Prepared by: NUR AZRINA BT ZAINI NUR HAZIRAH BT AZHARI

Introduction of polarisation

• Understanding polarization and how to measure a change in its state is important in many applications.

• Polarizers can be used to measure changes in magnetic fields, temperature, molecular structure, chemical interactions, and acoustic vibrations.

• Polarizers can be utilized in imaging applications to reduce glare and hot spots, enhance contrast, and perform stress evaluation.

What is polarization?

definition

•  The process of transforming unpolarized light into polarized light is known as polarization

Methods of polarizing light

• Polarization by Transmission• Polarization by Reflection• Polarization by Refraction• Polarization by Scattering

By transmission

By Reflection

By refraction

By scattering

Applications of polarized light

• Polaroids are used in sun glasses. They reduce the intensity and the glare by cutting down the horizontally polarized light.

• Polarized light is used in photo elastic stress analysis.• For 3-D view, special type of glasses, which have polaroids with

perpendicular axes, are used.• Polarized light is useful to determine size and shape of viruses.• This polarized light finds many practical applications in

industry and engineering science.

Application of polarisation

Uses of polaroids

• These reduce excess glare and hence sun glasses are fitted with Polaroid sheets.

• These are also used to reduce headlight glare of cars.• They are used to improve color contrast in old oil paintings.• These are useful in 3-D motion pictures i.e., holography.• Wind shields of automobiles are also made of Polaroid sheets.