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The article on Circular polarization does it better than I would be likely to achieve in less than an hour or two. Or Hyperphysics, or Google.

Feb 15, 2024 — i.e., a battery with a high energy density can store a lot of energy. The battery's capacity to absorb and deliver electricity is referred to as ...

Cinema 3D glasses (at least those made by Read-D) are circular polarized. This has the advantage that the polarized light reflected from the screen doesn't depend on the angle between your eye and the screen and so you can move your head around while watching. But when you look in a mirror the rotation direction is reversed on reflection.

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Feb 4, 2020 — Polarization filters function by selecting or restricting light waves traveling in a single plane. The orientation of the filter determines the ...

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See the Wiki article on Polarized 3D glasses. Most likely, you have a pair of circularly polarized glasses. The mirror reverses the circular polarization.

Apr 29, 2022 — Optics in LED lighting can include the spatial distribution of light from the diode itself, and the reflectors, lenses, and holders that cut off ...

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To my utter confusion, when closing the left eye and only looking through the right eye, I could not see the right eye in the mirror. The light could not pass through the same polarized lens twice. (I could, however, see the closed left eye clearly.)

The shutter glasses used with most home 3D LCD-TV have a linear polarizer and when turned off you can see through them in a mirror.

See How do 3D glasses work - Sixty Symbols (Youtube) for a video explanation. The key is that the light has to pass through the lens twice, if it goes through once you just see the polarized light, if it goes through twice it doesn't see light at all. See the image on the right.

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I would expect the opposite to be true, as light going out the right lens with polarization X and coming back in with the same polarization X should pass through unaffected.

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