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The glasses that we use for 3D viewing, do they allow infrared light to pass through them? Infrared rays pass through normal glass right? I need the pupil illuminated through infrared LEDs so I need to whether infrared light can pass through each and every kind of glass.

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if it's a polariser based glasses, then no.. IR rays are blocked by polariser as are visible rays.. –  Vineet Menon Jun 15 '12 at 5:07
    
Active Shutter Glass is used for 3D viewing. en.wikipedia.org/wiki/Active_shutter_3D_system if it is polariser based glass then visible light would also not pass through it and how would a person look through it?? –  siddharth Jun 15 '12 at 5:18
    
the projection is based that way...2 cross polarised projectors are used to project different images on screen and the glasses would selectively allow only one of them to pass thru.. I would suggest you to go thru the wiki article.. –  Vineet Menon Jun 15 '12 at 5:20
    
From where did you get information that infrared rays are blocked by polarized glasses? Can you give a reference link or something. –  siddharth Jun 17 '12 at 6:32
    
that I assumed from the fact that IR rays are actually non-ionizing EM waves exactly like light and polarizers actually work for any EM waves( non-ionizing). Thus, inferred...Actually if goes down to the working of polarizers, they don't allow a particular orientation of electric field..if you want a link, just search for IR polarizers in google. –  Vineet Menon Jun 18 '12 at 4:39

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