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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 .
These polarizers are more durable, and can polarize light much better than plastic Polaroid film, achieving polarization ratios as high as 100,000:1 and absorption of correctly polarized light as low as 1.5%. [5] Such glass polarizers perform best for long-wavelength infrared light, and are widely used in fiber-optic communication.
One can test whether sunglasses are polarized by looking through two pairs, with one perpendicular to the other. If both are polarized, all light will be blocked. Unpolarized light, after being reflected by a specular (shiny) surface, generally obtains a degree of polarization.
Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in the lenses; however ...
For the example of glass (n S ≈ 1.5) in air (n 0 ≈ 1.0), this optimal refractive index is n 1 ≈ 1.225. [20] [21] The reflection loss of each interface is approximately 1.0% (with a combined loss of 2.0%), and an overall transmission T 1S T 01 of approximately 98%. Therefore, an intermediate coating between the air and glass can halve the ...
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