The discussion centers on the behavior of linearly polarized light when it reflects off various surfaces, particularly focusing on whether the polarization is preserved or randomized during diffuse reflection. The scope includes theoretical considerations and practical applications, such as 3D cinema technology.
Participants express differing views on whether diffuse reflection randomizes polarization, with some asserting it does while others suggest that certain conditions can preserve polarization. The discussion remains unresolved regarding the extent to which different surfaces affect polarization.
The discussion highlights the dependence on surface characteristics and the complexity of polarization effects, but does not resolve the specific conditions under which polarization is preserved or randomized.
Yeah, this is what I heard today, as well. That diffuse reflection does randomize the polarization, but that if you have some metal coating, the polarization can be preserved. I was told that's why, like you said, 3D cinema can't just use any projection screen, but one with a metallic layer on top of it. So I guess paper randomizes polarization, while a mirror would preserve it, even if reflection was diffuse.Andy Resnick said:It's true some 3-D cinema uses polarization effects- but those also require use of a metallic 'scrim', which is why the polarization states are maintained. Scattering off a rough dielectric will randomize the polarization.