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[quote=Priyanshu]Stand to one side of a window and look at it from an angle so you can see it relfect an image, like a mirror does. Then hold the glasses between you and the window and look through a lens at that relfection. If you turn the glasses a quarter turn (90 degrees) the relfection should fade if the lens is polarized.This doesn't work with relfections off polished metal surfaces, so it won't work with a mirror. But it works with nonmetals like glass or shiny painted surfaces. And water. When light bounces off a level surface like water, it gets polarized horizontally. Sunglass lenses are polarized vertically to block that. But standing off to one side of a window, the relfection is polarized vertically so you have to give the glasses a quarter turn to block the relfection.You can also check with a known pair of polarized glasses. If you look through both pair of glasses and turn one of them sideways, the light coming through will fade to almost black.[/quote]
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