Obey Refraction It's The Law Physics Geek Humor White Cotton Face Mask

Showcase wry optical humor with this design featuring Snell's law, which says that the ratio of the sines of the angles of incidence and of refraction is a constant that depends on the media. Snell's law is also known as Descartes' law or the law of refraction. Make others do a double-take with this scientific truism refraction humor cotton face mask that includes the tongue-in-cheek saying "Obey Refraction It's The Law". No need to be a physics major or physics teacher to enjoy!