A polarizing filter is a device that allows light to pass only if it's wiggling in a certain direction. ... Light reflecting off horizontal surfaces like the road, water, or snow is horizontally polarized. A polarizing filter oriented vertically will filter out the glare, but still allow plenty of light through.

What are the types of polarizer?

The common types of polarizers are linear polarizers and circular polarizers. Polarizers are used in many optical techniques and instruments, and polarizing filters find applications in photography and LCD technology.

What is a polarizing filter used for?

A polarizing filter or polarising filter (see spelling differences) is often placed in front of the camera lens in photography in order to darken skies, manage reflections, or suppress glare from the surface of lakes or the sea.