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Phasors  Reflection And  Refraction
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Phasors Reflection And Refraction

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Transcript

  • 1. How can phasors explain reflection and refraction? Quantum Behaviour
  • 2. To review…
    • Last lesson:
      • We found out that a phasor represents the phase of a photon at a particular time
      • It spins at it frequency
      • It travels at the speed of light
      • The length of the phasor is related to the probability of phasors producing light at a point (resultant phasor)
      • The length of an individual phasor is usually 1
      • The probability of a photon hitting a point is the square is the square of its amplitude (also the intensity)
  • 3. Phasors, Reflection and Refraction
    • Today we will:
      • Use the phasor model (quantum model) to explain light behaviour during
          • Reflection
          • Refraction
      • Understand how the ‘quantum world’ anything is possible – it is just how probable that we can calculate
      • To start – recall the equations to calculate the phase angle of a photon travelling along a path…
    20m
  • 4. Calculating Phase Position
    • Phasors leave a source in phase – i.e. lined up
    • To calculate their relative phase at a time and path length we use:
    • Trip Time = Distance / Speed
    • Speed = f x  = c where c = speed of light = 3 x 10 8 m/s
    • Number of Rotations = Rotations per second x Number of seconds
    This is frequency
  • 5. Reflection
    • Using your GCSE knowledge, draw the path of a light ray/photon from the source to the eye…
    Light Source Opaque Block Mirror
  • 6. Reflection
    • Using your GCSE knowledge, draw the path of a light ray/photon from the source to the eye…
    Opaque Text You probably drew this, a straight line reflecting off the centre of the mirror… But in the ‘Quantum World’ anything is possible…!
  • 7. Reflection
    • Now try it with phasors…
  • 8. Resultant and Intensity
    • Add all of the arrows ‘tip-to-tail’…
    • Where they ‘line up’ is where the photons make the greatest contribution
    • Where they ‘curl up’ they make the least contribution
    Phasors ‘ curl up ’ Low intensity due to these paths Phasors ‘ line up ’ High intensity due to these paths
  • 9. Refraction
    • Let’s try the same thing with Refraction…