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Unformatted text preview: • Sinusoidal waves – Source: Simple Harmonic Motion – History: Period T – Snapshot: Wavelength Sinusoidal Waves The general equation for the displacement caused by a traveling sinusoidal wave is k = 2 π / λ is the wave number = 2 π f = 2 π /T Waves in Two and Three Dimensions Waves in Two and Three Dimensions 1/11/2012 2 Power and Intensity Power = rate at which energy is transferred Intensity = ratio of power to area The Index of Refraction • Light waves travel with speed c in a vacuum, but they slow down as they pass through transparent materials such as water or glass or even, to a very slight extent, air. • The speed of light in a material is characterized by the material ’ s index of refraction n , defined as...
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