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How do the new 3D glasses (not red/cyan) work?
I went to Top Gear Live where they gave out 3D glasses. These aren't like the usual red/blue glasses but both lenses appear clear. However I noted that when I look through the glasses at a computer screen, the lens on the left appears to be a very dark blue, making it difficult to see the screen through (and makes the dirt on the screen stand out) and when I turn the glasses back to front the opposite lens goes the blue colour, while the 1st lens is clear again. This only happens with my computer screen, (i.e. when I look at a normal light bulb it appears that both lenses are see through).
Could anyone tell me how these glasses work, and why the lenses only turn blue looking through them in one certain direction and only when looking at my computer screen?
These sound like polarised lenses, not the flickering ones, but static polarised ones...
One of the lenses will let in all the light which is vertical and less and less either side until the polarisation stops the light at 90 degrees to the vertical getting in. The other does the opposite (letting in all horizontally plain polarised light).
As a light bulb produces non-polarised incoherent light (a mess of all the different angles) it makes little difference which lense you look at it through (but the intensity will be somewhat reduced, but probably not noticeable) however, your computer screen produced more "uniform" light, meaning it is polarised slightly in one plane. This means there there is a noticeable difference between them when you look at it.
To test this, try turning your head at 90 degs to the screen and see if the things you observed only happening with one lense swaps to the other lense.
The way these produced 2dd is almost identical to the normally 3d glasses, what happens is there is one projector only sending out light polarised to the horizontal and another only to the vertical, instead of one sending it out red and one sending it out blue. When these projections are overlaid and looked at through the glasses one image can be seen through one lense and one through the other. This gives a 3d image in the same way as your eyes see two different images and put them together to get depth perception (3D).
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