How do the red/blue 3D glasses work?
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The image you’re looking at is actually two images overlaid, with one being slightly offset to the left and coloured entirely in red, and one being offset to the right and being coloured entirely in blue. This means that when you put the glasses on, with the coloured filters, your left eye only sees the left offset image and your right eye only sees the right offset image (because the blue plastic filters out the red light and vice versa). The results in a sense of depth akin to how your two eyes see slightly offset versions of the world.
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