Polarization, How Polarizers Work, & Malus' Law

Polarizers are basically gates that allow light to come through that is only oriented a certain way based on the electric field component of the electromagnetic wave. Polarized sunglasses and lots of other things work based on this principle. Malus' Law describes how the intensity of light changes after it travels through a polarizer.

0:00 - Intro, what does a polarizer do?
1:23 - How does a polarizer work?
3:34 - Unpolarized light through a polarizer (I=I0/2)
5:08 - Malus' Law (polarized light through another polarizer)
6:16 - Some examples of polarizers being used