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Day109 28 Feb2008 Waves
 

Day109 28 Feb2008 Waves

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  • a. Snell's Law   n 1 sin  1 = n 2 sin  2   b. Critical angle ( Symbol:  c ) angle of incidence for which angle of refraction is 90° (as light passes from a medium (n) into air or a vacuum)   sin  c = 1/n   (from nsin  c = 1.00sin 90°)   c. Total internal reflection occurs when angle of incidence is greater than critical angle.   Examples : fiber optics sparkling diamond rainbow d. Dispersion separation of polychromatic light into its component wavelengths as the light enters a dispersive medium obliquely. Different frequencies (colors) of light travel at different speeds through a dispersive medium.   Red, blue, and green light make white   i. Dispersive medium A substance in which the speed of a wave depends on its frequency. Glass is a dispersive medium for light.   Examples : Diamond Rainbow Chandelier Prism   ii. Non-dispersive medium One in which the speed of the wave does not depend on the frequency. A vacuum is non-dispersive for light.

Day109 28 Feb2008 Waves Day109 28 Feb2008 Waves Presentation Transcript

  • Thursday February 28 Day 109
    • Schedule
      • Wrap Up Waves Today
      • Pre-Quiz HW
      • Review Tomorrow
      • Unit Test Monday
      • 25 Week MP Ends March 5
  • Terminology
    • Monochromatic Light
      • Light Of A Single Color (Frequency)
      • Lasers Are Monochromatic
    • Polychromatic Light
      • Many Colors (Frequencies)
      • Sunlight Appears “White” Because Of How Our Eyes Respond To A Mixture Of Colors Across The Spectrum Of Visible Light
  • Light As A Wave
    • In Our Final Unit Of The Year, We Will Learn That Light Has Both WAVE PROPERTIES And PARTICLE Properties
    • In Other Words, Sometimes Light Behaves As A Wave, Sometimes As A Particle
    • In This Unit, We Have Only Considered The Wave Properties
    • Let’s Summarize
  • Light As A Wave
    • Evidence That Light Behaves As A Wave
      • It Has A Wavelength We Can Measure
      • Its Frequency Can Be Measured
      • It Reflects Like A Wave
      • It Refracts Like A Wave
      • It Diffracts Like A Wave
      • It Exhibits Constructive And Destructive Interference
      • It Can Be Polarized
  • Polarization
    • Recall This View Of An Electromagnetic Wave, Such As A Light Wave
  • Polarization
    • Most Light Sources Are Not Light This
    • They Normally Consist of Waves In A Variety of Orientations
    • This Is How They Would Look In A Head-On and an Oblique View
  • Polarization
    • We Can Simplify This Complex View Into A Wave With Half Of Its Waves Oriented Horizontally And Half Vertically
    • Here Is A Head-on View Of Simplified UNPOLARIZED Light
  • Polarization
    • When A Wave IS POLARIZED, One Of The Orientations Is Blocked
    • One Material That Can Do This Is A Polaroid Filter
  • Polarization
    • A Picket Fence Analogy Can Be Used
  • Polaroid Material
  • Polarizing Sunglasses
    • Link To Animation
  • Homework
    • Waves Pre-Quiz
      • Pay Special Attention To Part II Questions (#64-#80), Including Measuring and Constructing Reflected and Refracted Rays
      • Use Your Written Notes
      • Use Posted Class Notes
        • First Day Of Waves Was January 29
      • Use Your Reference Tables