Only some humans can see this type of light

When I did photography I had a collection of polarizing filters for all the different filter thread sizes for my camera lens. Every time I acquired a new camera lens that had different filter sizes, I had to buy two new filters with one A1 sky light to protect the front lens and block UV and a polarizer filter. This always added another $80-$250 to every camera lens purchase price because I only would by German made B+W filters. Polarizing filters for camera lens are made so they can rotate on the front of the camera lens so it can be oriented to block glare to coincide to the orientation of the light source such as the Sun or other point light source. This allows to take pictures though a glass window and capture the subject behind the glass or reduce glare on a reflective surface such as a car, wet pavement, etc. or foliage such grass, trees, or intensify the blue of the sky and add more detail to clouds. What the pretty young Physics Girl didn’t show was how polarizing filters are made. With eye glasses or camera lens filters, are made of three layers. The two outside layers sandwich a middle layer of a corrugated thin transparent film. The corrugations only allows photons traveling in one direction/orientation to pass through while the rest of the scattered photons are blocked. The corrugation is so small measuring in microns that it is beyond the resolution of the human eye, photographic film or photosensors.