Ad: Obey Refraction It's The Law Snell's Law Physics Face Mask
Optical physics humor featuring Snell's law -- also know as the law of refraction. Snell's law says that the ratio of the sines of the angles of incidence and of refraction is a constant that depends on the media. No matter where you are or what you do you'll enjoy "Obey Refraction It's The Law" on this educational scientific humor cotton/polyester face mask! No need to be a physics teacher or physics major to enjoy. myPhysics
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