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lecture08

# lecture08 - Reflection a Mirror reflection normal to...

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Reflection 1 θ 2 θ 2 1 θ θ = 1 θ 2 θ in out normal to surface b) Diffuse reflection a) Mirror reflection c) Reflection from curved surfaces acoustical mirrors (curved mirrors) whispering galleries S S source image wall (mirror)

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Refraction: Snell’s Law 2 2 1 1 sin sin θ θ n n = index of refraction: v c n = 1 θ 2 θ 1 2 f f = 1 2 1 2 2 1 λ λ = = v v n n Example: 1 θ 2 θ 2 θ 3 θ n 1 n 2 n 3 3 3 2 2 1 1 sin sin sin θ θ θ n n n = = 1 3 1 3 If θ θ = = n n 2 3 from t independen is n θ 1 2 1 2 1 2 sin sin λ λ θ θ = = v v In optics: Sound waves in atmosphere when temperature varies with height Sound traveling against the wind Mirage
Speed of Sound μ F v = Speed of waves in strings (review): Speed of longitudinal waves in a solid rod: ρ E v = ρ E - Young’s modulus - density m - mass V - volume F - tension - linear density m - mass L – length of the string L m / = μ μ V m / = ρ The Young’s modulus is the stress divided by the strain. 0

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lecture08 - Reflection a Mirror reflection normal to...

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