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Nature of Light and Laws of Geometric Optics

Nature of Light and Laws of Geometric Optics. The nature of light Reflection Refraction Index of refraction Huygens’ Principle Dispersion and Prisms Total Internal Reflection. The Nature of Light. Light as Particles Tactile Theory (Ancient Greeks) Emission Theory (al-Haitham) Newton

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Nature of Light and Laws of Geometric Optics

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  1. Nature of Light and Laws of Geometric Optics • The nature of light • Reflection • Refraction • Index of refraction • Huygens’ Principle • Dispersion and Prisms • Total Internal Reflection

  2. The Nature of Light • Light as Particles • Tactile Theory (Ancient Greeks) • Emission Theory (al-Haitham) • Newton • Light as Waves • Huygens • Maxwell • Quantum Theory • Photons

  3. Fizeau’s Method for Speed of Light Measurement

  4. Ray Approximation in Geometric Optics

  5. Reflection Specular Reflection Diffuse Reflection

  6. Double Reflection

  7. Refraction

  8. Concept Question Suppose the sprinters wish to get from point Q on the beach to point P on the parking lot as quickly as possible. Which path takes the least time? • a • b • c • d • e • All paths take the same amount of time.

  9. Index of Refraction Going from one medium to another, the frequency of light does not change but its wavelength does. If one of the medium’s is vacuum (n=1), Snell’s Law of Refraction

  10. Announcements • Cell phones on silent. • Fermat’s principle: nothing quantitative– just understand the idea of minimum time.

  11. h Light Propagation Through a Slab q1 a q2 h x d

  12. Huygens’ Principle

  13. Huygen’s principle & Plane waves

  14. Huygen’s principle & diffraction

  15. Huygens’ Principle Applied to Reflection and Refraction

  16. Dispersion and Prisms angle of deviation

  17. Measuring n Using a Prism dmin

  18. Angle of Deviation a d q4 q1

  19. Total Internal Reflection Critical Angle, qc Only for n1 > n2

  20. View From a Fish Eye For q<qc: The fish sees above the water For q=qc : The fish sees the shoreline For q>qc : The fish sees the pond bottom

  21. Applications of TIR Retroreflector Periscope Fiber Optic Cable

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