In holography, the first part is the same: a distorted wavefront carries the information to recreate a 3D image. The size of the image only depends on the magnification of the imaging system-there is no connection between the size of the image and the viewing angle. The white screen scatters the light in every direction, so no matter where you are in the theater, you can see the image (after craning your head to avoid that dude). A lens system recreates that image at some distance, where it falls on a white screen. In a 2D projection system, a distorted light field carries the information about the image. Perhaps the best way to illustrate this is to compare a 2D projection system with a holographic projection system. How fundamental? It's actually a physical law. So I was a bit surprised to see the ideas applied to holographic displays. I have to admit, I never even thought of it, but once you see the idea it is like being slapped silly by Captain Obvious. And that was appropriate the ideas that they had-medical imaging, high-resolution imaging, and security applications-have all (with the exception of security) proved to be possible but really difficult. I know the researchers who pioneered this idea, and they were all rather conservative about possible applications. But if we could control how they scatter light, we could turn them into useful things like focusing devices. Scattering materials, like white paint or sugar cubes, turn light into a chaotic jumble. Further Reading Seeing through milkThe idea behind the research was simple.
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