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Optics: Applications of Reflected and Refracted Light

Optics: Applications of Reflected and Refracted Light. Sections: 23-6, 24-4 . Total Internal Reflection. n2 < n1 Light does not emerge For Ray J, θ < θ c For Ray K, θ = θ c For Ray L, θ > θ c . Total Internal Reflection. Used for Fiber Optics

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Optics: Applications of Reflected and Refracted Light

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  1. Optics: Applications of Reflected and Refracted Light Sections: 23-6, 24-4

  2. Total Internal Reflection • n2 < n1 • Light does not emerge • For Ray J, θ < θc • For Ray K, θ= θc • For Ray L, θ> θc

  3. Total Internal Reflection • Used for Fiber Optics • Transmit information with light instead of electricity • Analog Signals vary the amplitude of the signal • Radio, analog television • Digital Signals • Light On = 1 • Light Off = 0

  4. Effects of Refraction • Mirage – change in nair due to change in temp • Light ray aimed at road encounters smaller n • Light bent away from normal • You see light from sky, looks like a puddle • Sunrise, Sunset – sun’s image refracted by earth’s atmosphere • Object in liquid – appears closer to surface than it is

  5. Dispersion of Light • ns depends on λof light • ns is greater for shorter λ • Violet light is bent more • ns is smaller for longer λ • Red light is bent less • Dispersion – separation into spectrum by refraction

  6. Dispersion of Light • Rainbows – dispersion in water droplets • Different light sources have different spectra

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