• Question: How does 3D glasses work?

    Asked by ablek to Helen on 19 Jun 2013.
    • Photo: Helen Tunbridge

      Helen Tunbridge answered on 19 Jun 2013:


      I’ve just had to look this up myself, but I think the way it works it to use polarised light. So when you watch a film, what you see on the screen is two images set slightly apart, one polarised in one direction and the other in the other direction. Then you have to wear the 3D glasses to bring the fuzzy image into 3D, so each lens of the glasses is polarised in one direction, which complements the image on the screen. Basically only one of the images from the screen can make it through the left lens, and the only the other one can get through the right lens. So you see two slightly differing images, one in each eye, and your brain reassembles it into a 3D image, much as it does when you look at normal 3D objects.

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