PHY214 Ch 35

PHY214 Ch 35 - Chapter 35 Interference 35-1 Interference...

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PHY214- 2006 Chapter 35 Interference 35-1 Interference 35-2 Light as a Wave 35-3 Diffraction 35-4 Young’s Interference Experiment 35-5 Coherence 35-6 Intensity in Double-Slit Interference 35-7 Interference from Thin Films 35-8 Michelson’s Interferometer

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PHY214- 2006 35-2 Light as a Wave Huygen’s principle Every point on a wavefront acts as a point source of secondary wavelets. The law of refraction (Snell’s law) 1 1 2 2 v v λ λ = 1 1 sin hc λ θ = 2 2 sin hc λ θ = 1 1 1 2 2 2 sin sin v v θ λ θ λ = = Index of refraction: c n v = 1 2 1 2 and c c n n v v = = 1 1 2 2 2 1 sin sin c n n c n n θ θ = = 1 1 2 2 sin sin n n θ θ =
PHY214- 2006 35-2 Light as a Wave n v c λ λ = n n λ λ = n n v f λ = n c n c f f n λ λ = = = Wavelength depends on the light speed and the index of refraction. 1 v c n = and v f λ = Frequency does not change in different media. 1 1 1 n Ln L N λ λ = = 2 2 2 n Ln L N λ λ = = ( 29 2 1 2 1 2 1 Ln Ln L N N n n λ λ λ - = - = - Phase change h N 1 -N 2

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