Should this not be the case whenever light strikes a thick mirror on the whole (obliquely)?? Someone please clarify.
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$\begingroup$ We would, if we had thick enough mirrors and weren't distracted by coloration of the glass. $\endgroup$– RuslanCommented Apr 4, 2021 at 7:45
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$\begingroup$ Did you try to do the math? $\endgroup$– Norbert SchuchCommented Apr 4, 2021 at 13:48
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1 Answer
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These rainbows exist and our eyes do see them - they are just extremely thin, plus our brain filters out this information, but the edges of bright objects on dark background in the mirror do have a thin rainbow along them. Our eye is using this rainbow to infer the image comes from a mirror.
I once saw an exhibit at a modern art museum - a seemingly black-and-white painting. When looking at it, it felt like you were looking at a mirror, despite the image not depicting anything in the room. A closer look revealed that the artist added thin rainbow-colored edges to all objects on the drawing, which tricked the brain into thinking you were looking at a mirror.
