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The needle-like crystals are aligned during the manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic : it tends to absorb light which is polarized parallel to the direction of crystal alignment but to transmit light which is polarized perpendicular to it.
However, this crystal is seldom used as a polarizer, since the dichroic effect is strongly wavelength dependent and the crystal appears coloured. Herapathite is also dichroic, and is not strongly coloured, but is difficult to grow in large crystals. A Polaroid polarizing filter functions similarly on an atomic scale to the wire-grid polarizer ...
It was the originator of the polarized sunglass as it is known today. It manufactured the lenses using a process that was licensed from Polaroid Corporation. Cool-Ray paid Polaroid a royalty in the early 1940s. [9] In 1965 Polaroid moved its production to Vale of Leven in Scotland, a few years later in 1972 the production of sunglasses was ...
Polaroid B.V., a Dutch manufacturer of instant film and cameras, owner of Polaroid Corporation's brand and intellectual property; Polaroid (polarizer), a type of synthetic plastic sheet used to polarize light; Polaroid Eyewear, with glare-reducing polarized lenses made from Polaroid's polarizer; Polaroid, a 2019 American horror film directed by ...
Sunglasses can improve visual comfort and visual clarity by protecting the eye from glare. [24] The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces, such as water. They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface ...
A polarized 3D system uses polarization glasses to create the illusion of three-dimensional images by restricting the light that reaches each eye (an example of stereoscopy). To present stereoscopic images and films, two images are projected superimposed onto the same screen or display through different polarizing filters .
Polarized 3D glasses allow for color 3D, while the red-blue lenses produce an image with distorted coloration. An active shutter 3D system uses electronic shutters. Head-mounted displays can filter the signal electronically and then transmit light directly into the viewer's eyes. Anaglyph and polarized glasses are distributed to audiences at 3D ...
The original meaning of dichroic, from the Greek dikhroos, two-coloured, refers to any optical device which can split a beam of light into two beams with differing wavelengths. Such devices include mirrors and filters , usually treated with optical coatings , which are designed to reflect light over a certain range of wavelengths and transmit ...