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# Phasors Refraction And Gratings

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### Transcript

• 1. How can phasors explain refraction and diffraction gratings? Quantum Behaviour
• 2. To review…
• Last lesson:
• We found out photons explore ‘all paths’ when going from a source to a detector
• The path length has an effect on the orientation of the phasor when it hits the detector
• If phasors ‘line up’ they increase the probability of light at that point
• If phasors ‘curl up’ they reduce the probability of light at that point
• Probability = Resultant 2 = Intensity
• For a mirror, the shortest paths are more likely to result in light
• 3.
• 4.
• 5. Refraction with Phasors
• Today we will:
• Use the phasor model (quantum model) to explain light behaviour during
• Refraction
• Grating
• To start – what is the probability of light due to the phasors below..?
• What is the maximum probability from this combination?
• 6. 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
• 7.
• Resultant = 1 therefore 1 2 = 1
• Maximum possible resultant = 3
• Maximum probability = 3 2 = 9
• 8. Refraction
• Let’s try the same thing with Refraction…
• 9. Refraction
• With refraction, the phasors travel at different speeds in different media.
• Light also changes direction – does quantum theory support this?
• 10. Curved Mirrors and Gratings
• To make photons ‘line-up’ there are 2 others ways:
• Curved mirror
• Grating
• 11. Curved Mirror
• With a plane (flat) mirror, there is not much chance of photons ‘lining-up’ at the detector
• 12. Curved Mirror
• With a curved mirror, there is more chance of photons ‘lining-up’ at the detector
• 13. Gratings
• A Grating gives a pattern due to constructive and destructive interference in the waves explanation of light.
But can we explain this using ‘quantum theory’?
• 14.
• 15.