Had you watch Final Destination 3D? Or do you still remember Spy Kids 3D?? Wore those red-cyan 3D glasses before?
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3D glasses works on the principle of stereoscopic view. Stereoscopic is the kind of view, where a separated image was captured by each eye distanced 2 inches apart respectively, and our brain clarify both images and analyze the depth distance, before combining into a single 3D image. This is also the presume why, we can't walk properly with an eye closed, because we're not able to presume the distance in front of us!
There're assorted kind of 3D glasses available today, but classical 3D glasses are red-cyan glasses which works on color filtration, and polarized glasses which works on light-polarization. If you look closely to this polarized glass, one lens is vertically split while the other is horizontally.
Polarized 3D glasses
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In 3D cinema providing you this red-cyan glasses, the screen was projected by 2 different sources. One projecting the movie in red color, while the other one projecting in cyan color, slightly displaced from the first one. The presume 3D glasses was red-cyan is because each lens functions to filter their own color, allowing 1 image entering just one eye. Hence our left eye sees the image projected by red projector, while right eye sees the image from cyan projector which slightly displaced, creating illusion that the movie is in 3D. Any way the ability of the movie isn't fair adequate since we filtered off some colors here.
With polarized glasses, 2 projectors were used too, to supply 2 images which is plane-polarized perpendicular to each other. Polarized lens works the same way as red-cyan lens do, to filter off 1 image and allowing the other entering your eye. By combining 2 images slightly displaced from each other, we see a movie with 3D depth!
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The working principle of these glasses is very simple, and you can even make your own 3D spectacles by development your own polarized lens, simply by development thin lines horizontally and vertically across the lens!
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