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Interference of Light

Interference of Light. Refraction (a review). Character of the wave in different (transparent) media wave travels slower Index of refraction n = c/v frequency is constant (wavelength changes) Law of Refraction (Snell’s Law) n 1 sin q 1 = n 2 sin q 2. Huygens Principle.

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Interference of Light

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  1. Interference of Light

  2. Refraction (a review) • Character of the wave in different (transparent) media • wave travels slower • Index of refraction n = c/v • frequency is constant (wavelength changes) • Law of Refraction (Snell’s Law)n1 sin q1 = n2 sin q2

  3. Huygens Principle • Propagation of plane wave by Huygen’s principle

  4. Snell’s Law • Refraction • Similar triangles

  5. Young’s Double Slit

  6. Young’s Double Slit 1801 • Conditions for interference

  7. Young’s Double Slit Constructive interference phase difference to be an integral number of wavelengths

  8. Destructive Interference Condition Destructive interference (minima)

  9. Young’s Double Slit Intensity behavior

  10. Young’s Double Slit Intensity behavior algebraic approach

  11. Intensity by Phasor Method

  12. Young’s Double Slit Intensity behavior averaged over one period

  13. Interference upon Reflection • Thin Film • in air • coatings

  14. Phase changes upon Reflection Dense to less dense n1 > n2 Less dense to more dense n1 < n2

  15. Thin Film in Air (Soap Film) • Near normal incidence • Conditions for reflected light interference Assume Condition for there to be constructive interference

  16. Michelson Interferometer

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