Basis for global landline communication data transfer

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Unformatted text preview: 2013 “Snell’s law” Refraction, cont. n1 sin θ1 = n2 sin θ2 ! n2 sin θ1 = sin θ2 ≤ 1 n1 fish image No refraction if this is >1! crit sin θ2 = n1 /n2 Total internal reflection inside slower region if the angle is big enough. Try it out in a pool. From underwater, look up, out of the water: see a mirrored surface at big angles. Tuesday, November 12, 2013 “Where is that fish?” Fiber optics Total internal reflection. Basis for global, landline communication / data transfer. Tuesday, November 12, 2013 Dispersion If n = n( ω ) or, equivalently, n = n( λ) Shorter wavelengths have bigger index of refraction (can picture that they collide into more atoms, so they are slowed more than longer wavelenghts). So shorter wavelengths are bent more by the prism. Tuesday, November 12, 2013 Polarization ￿ E.g.: E = E0 y cos(kx − ω t) Polarized light wave. ￿ Most light sources (light bulbs, sun, etc) make unpolarized light, which is a superposition of randomly polarized light waves. Polarizing filters block the components except those with E along (actually perpendicular to) the polarizer’s axis. Tuesday, November...
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This note was uploaded on 02/11/2014 for the course PHYSICS 2C taught by Professor Hicks during the Fall '09 term at UCSD.

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