Not a comment on the theory, but if you want to play with the experiments yourself, find some old LCD electronics (calculators, etc) that can be sacrificed on the altar of curiosity. They typically have a strip of polarizing material above the display (rather, they did when I was growing up).
It’s a bit more elegant than trying to get some sunglasses oriented at 90° to each other.
Not a comment on the theory, but if you want to play with the experiments yourself, find some old LCD electronics (calculators, etc) that can be sacrificed on the altar of curiosity. They typically have a strip of polarizing material above the display (rather, they did when I was growing up).
It’s a bit more elegant than trying to get some sunglasses oriented at 90° to each other.