Why can i see hidden image with a polarized spec?

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SUMMARY

The discussion centers on the phenomenon of seeing hidden images through polarized spectacles. A user tested polarized glasses at a spectacle shop and observed that a seemingly simple image of a fisherman transformed into a more detailed scene with a fish when viewed through the glasses. This effect is attributed to the presence of a polarizing film on the image, which is oriented differently, allowing certain light waves to be filtered and revealing additional details.

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crays
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Hi, i can't find any article related to this question, i went to a spectacle shop, they claim their spectacle are polarized, i tested it by diagonally aligned the spectacles and yes it is polarized, but then sales man asked me to put on the spec and have a look at a picture.

First it was just a fisherman with a rod but with my spec i can see a fisherman with a rod and a fish. I wonder how this happens? Anyone could answer me pls? Thanks.
 
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Perhaps the picture was covered in polarizing film, oriented differently for the fish.
 

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