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lecture33 - Physical Optics 37.1-37.4 38.1-38.3...

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Physical Optics Physical Optics 37.1 37.1 -37.4, 38.1 37.4, 38.1 -38.3 38.3 Light is an electromagnetic wave . Wave properties: Diffraction – bends around corners, spreads out from narrow slits Interference – waves from two or more coherent sources interfere Background reading: Chapter 35 Practice: Chapter 37, problems 3, 5, 7, 9 Electromagnetic Waves Electromagnetic Waves Usually we keep track of the electric field E : amplitude all v B E r r r , , E B E o ) sin( ) , ( t kx t x ω = o E E r r v These are transverse waves, with two independent polarization directions.

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The Electromagnetic Spectrum The Electromagnetic Spectrum λ (m) f (Hz) 300 10 6 31 0 8 3 x 10 -3 10 11 3 x 10 -6 10 14 7 x 10 -7 5x10 14 4 x 10 -7 3 x 10 -9 10 17 3 x 10 -12 10 20 Radio TV Microwave Infrared Visible Ultraviolet X rays γ rays Infrared 780 nm Red Yellow 600 nm Green 550 nm Blue 450 nm Violet 380 nm Ultraviolet Double Slit (Thomas Young, 1801) . . . , 2 , 1 , 0 , sin ± ± = = m d m λ θ Result : Many bright “fringes” on screen, at angles screen Two slits, separation d m=2 m=1 m=0 m=-1 m=-2 incident light
The slits act as sources in phase. Due to diffraction, the light

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lecture33 - Physical Optics 37.1-37.4 38.1-38.3...

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