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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…