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well, I’m not sure what polarized light is, but the elastic property of plastic could help so the product will bend instead of shatter flying sharp pieces everywhere therefore not cutting anyone/anything.
Adding DNA
Makes better sunglasses for one, that will improve the visibility of the wearer, which will reduce glares on the road or in the work place and etc.
I am afraid you mean “photoelasticity”, while all the answers are directed towards general uses.
If you mean it, I am sure it’s being used, but how often, I guess I saw it only once; I think it has limited application.
That’s where a (transparent) plastic model of the product is put in a beam of light, & the resulting pattern of “fringes” (as they call it) is studied to understand the stress distribution throughout the model. Hence, know the points of stress concentration (probable locations of failure) and help avoid those; locations of low stress, to remove extra material may be, decreasing weight & cost (i.e. better/safer/cheaper products)