Screen tilted mirror what do you see fringes l screen

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Unformatted text preview: sin(ωt+2πx/λ +) = Elight source(x,t) L Light source L+ΔL/2 + = ΔL/ 2 ? ΔL Screen: Destructive interference Moving mirror: What do you see? Esum(x,t) = ½ · E0 sin(ωt+2πx/λ +) + ½ · E0 sin(ωt+2π(x+Δx)/λ +) = ½ · E0 sin(ωt+2πx/λ +) - ½ · E0 sin(ωt+2πx/λ +) = 0 Light source if Δx = λ / 2: sin(x+π) = - sin(x) + = ? Screen: Tilted mirror: What do you see? Fringes! ΔL Screen Intensity λ/ 2 ΔL Interference in daily life: Light source Screen 4 Do you want a bigger ‘interferometer’? There you go… Gravitational wave detectors Blue iridescence in animals? Summary for Interferometers The blue color and iridescence originate from constructive interference of blue light and destructive interference of all other colors. Michelson interferometers allow us to measure tiny displacements. Displacements of less than 100 nm are made visible to the eye! Interferometers find many applications in precision metrology such as for displacement, distance and mechanical stress measurements, as well as flatness measurements. Interferometers have played an important role in physics: Michelson-Morley experiment special relativity Testing general relativity: Gravitational wave detection Global survey of groundwater (GRACE satellites) 5...
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