The Arago spot played an important role in the discovery of the wave nature of light and is a common way to demonstrate that light behaves as a wave.
It also helps, if: … the knitting is aligned with the track below, or rather vice versa, something else that went after 1996.
In the case of homeotropically treated phase change dichroic LCDs, it quickly decays from 100% to <5% level instantaneously and then merges from 5% to zero level reasonably fast exhibiting almost no memory.
beer gut
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