Cylindrical Lens Puzzle: this cylinder of acrylic acts as lens that focuses light along a line rather than a point- and thus it can invert an image along its symmetry axis. Puzzle question: the word “GREEN” is flipped by this lens but the word “TOMATO” seems unaffected. Is the physics significantly different for red wavelengths as compare to green? Or is there another explanation/trick? Answer below. ➡️ Follow the link in my profile for info on where to buy this and other amazing items featured

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Lenticular Invisibility: this thin acrylic sheet is comprised of tiny cylindrical lenses which can allow images to be “out of focus” along one dimension which blurs thin images and hides them. This 70 lens per inch sheet is part of a lenticular optics kit that came as part of my @thecuriositybox subscription— amazing and fun! ➡️ Follow the link in my profile for info on where to find similar lenticular lens arrays and many other amazing items featured here on @physicsfun #lens #lensarray #cylind