Speaking of Fresnel lenses, one of the coolest applications is a plastic "wide-angle lens" sticker that you could affix to your car's rear window (https://www.a

Speaking of Fresnel lenses, one of the coolest applications is a plastic "wide-angle lens" sticker that you could affix to your car's rear window (https://www.amazon.de/-/en/WIDE-ANGLE-WINDOW-FRESNEL-OPTICAL/dp/B000N8E4Q0 https://www.amazon.de/-/en/WIDE-ANGLE-WINDOW-FRESNEL-OPTICAL...) to increase the field of view. Their popularity has dropped since the advent of "back-up cameras" however.