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lecture26

lecture26 - IV Optics Wavelength decreases ⇒ Frequency...

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Unformatted text preview: IV. Optics Wavelength decreases ⇒ Frequency increases ⇒ Note: 1 nanometer = 10-9 meter Nature of light. Spectrum of electromagnetic waves. A. Geometric optics 2. Reflection 1. Wave front and rays 1 θ 2 θ 2 1 θ θ = 3. Refraction: Snell’s Law 2 2 1 1 sin sin θ θ n n = index of refraction: v c n = 1 θ 2 θ 2 1 f f = 1 2 1 2 2 1 λ λ = = v v n n rays wave fronts 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 in out normal to surface diffuse reflection 2 3 from t independen is n θ Example: ? 50 33 . 1 00 . 1 2 1 2 1- = = = θ θ n n 2 2 1 1 sin sin θ θ n n = ( 29 35 50 sin 33 . 1 00 . 1 sin sin 2 1 2 1 2 = = = = θ θ θ n n ? 45 52 . 1 00 . 1 4 1 3 2 4 1- = = = = = = θ θ n n n n n Example: Equilateral triangle n=1.52 4 4 3 3 3 2 2 2 1 1 sin sin 60 sin sin θ θ θ θ θ θ n n n n = = + = 4 3 3 2 2 1 sin sin 60 sin sin θ θ θ θ θ θ = = + = n n 3 4 2 3 1 2 sin sin 60 sin sin θ θ...
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lecture26 - IV Optics Wavelength decreases ⇒ Frequency...

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