Why Guys: Fingerprint Scanners

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URBANA-CHAMPAIGN, Ill. (WCIA) — What’s the relation between a glass of water and a fingerprint scanner? Physics experts say “frustrated total internal reflection!”

Paul Kwiat, Professor of Physics and Director of the Illinois Quantum Information Science & Technology Center at the University of Illinois at Urbana-Champaign, joined WCIA for Wednesday’s Why Guys spot.

This week’s lesson is on refraction of light as it passes through materials through which light travels at different speeds — such as glass and water.

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