https://phys.org/news/2019-08-physicists-year-old-optical-problem.html
They say the problem originated 2000 years ago with lenses of the day but I did not know they existed at all that far back. I thought the first corrective lenses were made only 1300 years later, glasses.
Well, here is a short history of optics, I guess they go back a lot further than I imagined:
https://en.wikipedia.org/wiki/History_of_optics
