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Refraction and Polarization of Light 3/10/04

Refraction and Polarization of Light 3/10/04. Thursday: group project and in-class exercises Friday: Waves & Particles Coming up on Friday March 26 – Saturday March 27 – Physics Conference – Nobel Laureate Leon Lederman (Fri. 8 pm) – Student Poster Presentations. Law of Reflection.

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Refraction and Polarization of Light 3/10/04

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  1. Refraction and Polarization of Light 3/10/04 • Thursday: group project and in-class exercises • Friday: Waves & Particles • Coming up on Friday March 26 – Saturday March 27 • – Physics Conference • – Nobel Laureate Leon Lederman (Fri. 8 pm) • – Student Poster Presentations

  2. Law of Reflection “angle of incidence = angle of reflection” n1 n2 rfl rfr qrfl qrfr qi Law of Refraction “Snell’s Law” i

  3. Related Questions: • Where does the “Law of Reflection” come from? • Why does light change speed in different media? • Why does the frequency of light remain constant in different media? Has to do with the electromagnetic nature of light and the interaction of electromagnetic radiation with matter  the electric field interaction with the electrons

  4. Electromagnetic Radiation Review Changing E  Changing B  Changing E  Changing B, … How to get these kinds of changing fields?  Accelerated charges http://webphysics.davidson.edu/Applets/Retard/Retard_FEL.html Polarized vs. Unpolarized

  5. Re-Radiation + Interference/Diffraction • Reflection • Changing speeds • Polarization Polarization Absorption Reflection (video demo) Scattering (video demo)

  6. a q Not all wavelengths are equal… Consider single slit diffraction:

  7. Different wavelengths interfere diffract refract scatter Differently  “dispersion”  rainbows! Scattering: longer wavelengths diffract more…  bend around corners  get around obstacles more than shorter wavelengths (video demo)

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