A great illustration of this is the early 1900s patent for an airplane with plano-convex cylindrical lens wings made of glass to be used on sunny days to fly over WWI's enemy trenches and at least blind, if not set on fire, the enemy troops.
See, that's a perfect illustration of someone being in love with their impractical idea. I mean, it was hard enough to make aircraft fly back then anyway, let alone setting extra engineering tasks of oddly shaped wings, or heavy glass construction, then add the restriction that it would only work during the day, in sunshine.
I mean, if someone is going to run the risk of flying over enemy lines in broad daylight, simply dropping incendiary devices would be far more practical.