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Understanding Electromagnetic Wave Interactions with Medium at the Microscopic and Macroscopic Levels

Explore the intricate interaction between EM waves and electrons, resulting in complex electric fields. Delve into the macroscopic description of light waves and particles, including refraction phenomena like Snell's Law and total internal reflection. Discover applications in optical fiber and prism color dispersion.

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Understanding Electromagnetic Wave Interactions with Medium at the Microscopic and Macroscopic Levels

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Presentation Transcript

  1. Lecture 39 Microscopic Point-of-View: • Interaction between EM waves and the medium • Specifically; with electrons in the medium: • Resultant electric fields are complex • original field, radiation field, re-radiation field... Macroscopic Description • Light wave + Wave front • Light particles (photons) speed in medium: • n = index of refraction • Wavefront • f = f’ (determined by oscillating frequency of original source)

  2. Refraction Phenomena Snell’s Law:

  3. Clicker IQ 38.1c

  4. Clicker Question Explanation • from IQ Library • I.Q. 36.1c Explanation: Small angle approximation

  5. Total Reflection Region Time Reversed Situation

  6. Reflection/Refraction Critical Angle As θ2 increases, θ1 increases more rapidly At critical angle, θ2 = θc θ1 = 90°

  7. Application: Optical Fiber [Ch24.HW4.009] Total reflection region

  8. Derivation of Snell’s Law

  9. Prism Color Dispersion At each surface, the light ray is bending Violet light has more bending than red

  10. Two Prisms Convergent Divergent

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