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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 - PowerPoint PPT Presentation
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Optics: Applications of Reflected and Refracted LightSections: 23-6, 24-4
Total Internal Reflection n2 < n1 Light does not emerge
For Ray J, θ < θc For Ray K, θ = θc
For Ray L, θ > θc
Total Internal Reflection Used for Fiber Optics
Transmit information with light instead of electricity
Analog Signals vary the amplitude of the signalRadio, analog television
Digital SignalsLight On = 1Light Off = 0
Effects of Refraction Mirage – change in nair due to change
in tempLight ray aimed at road encounters
smaller nLight bent away from normalYou 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
Dispersion of Light ns depends on λ of 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
Dispersion of Light
Rainbows – dispersion in water droplets
Different light sources have different spectra