Linear Glass Polarizing Filter （P22F3X9101）

A polarizer or polariser (see spelling differences) is an optical filter that lets light waves of a specific polarization pass through while blocking light waves of other polarizations. It can filter a beam of light of undefined or mixed polarization into a beam of well-defined polarization, that is polarized light.

What is a polarizer used for?
A polarizing filter, or polarizer, is used to intensify blue skies, brighten or saturate colors, and reduce reflections, glare and haze in images. The same as other types of lens filters, polarizers sit over your lens and can either screw into your lens' filter thread or be used with filter holders.

[waterfuel]

object at average distance away can not be seen with naked eyes, but can be seen with special filtering, what arrangement is that? The blue + red may be at equal level being reflected back, so as no color gray is perceived. The background light blue sky is visible. What about circular and linear polarization filter lenses? Wavelengths are being suppressed, or absorbed, for GRAY object to normal eyesight. Russian man last year has section of filter glass with chemical coating that reveals hidden objects when looking through it. This is very important. (You know what I'm talking about)<<>>>???