Polarized light is produced using filters to selectively block the transmission of light waves

• Linearly polarized or plane polarized, light is entirely polarized in one direction that is perpendicular to the direction of propagation

Ways in which polarized light can be produced from unpolarized light:

• Selective absorption
• Reflection
• Scattering

Malu’s law states how the transmitted intensity of light through a polarized is related to the incident intensity of light: $I_{out} = I_{in} \cos ^2 \theta$

Applications of polarization:

1. Stress analysis in materials
2. Sungalsses
3. Design and production of LCD displays
4. Simple sugars such as fructose and sucrose are optically active molecules that rotate in the direction of polarized light
5. By applying different voltages to different areas of a liquid crystal, an LCD device can form various patterns of light and dark regions corresponding to letters or numbers