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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
Coherent waves
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Waves are in phase and have the same frequency.
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Phase? V=f(lambda)?
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Phase Difference
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The separation between two points on the same wave. Can be measured in radians or a fraction of a wavelength
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Remember sine graph. Origin to any point of x (pi radians) = to the wavelength
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Division of Amplitude
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A wave is split into its transmitted and reflected counterparts. The reflected waves usually interfere.
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Remember air wedge experiment or thin film experiment.
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Division of Wavefronts
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When two coherent waves are produced from the same point or line source. When they diffract, they interfere with each other producing an interference pattern.
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Young's double slit experiment
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Optical Path Difference
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The difference between the optical lengths of two sources or points. (n2l2-n1l1). This has a relationship with the wavelength that either indicates destructive or constructive interference.
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Optical path length?
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Constructive interference (OPD)
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Constructive interference occurs if the OPD = a whole number multiple (m) of wavelengths (lambda).
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Wavelength multiple?
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Optical Path Length
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The geometric length (measured in metres) of the light path * the refractive index of the medium. (e.g. in air: 1, in water: 1.33)
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Does refractive index change the path length?
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Non-Reflecting Coating
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The change in phase (of pi radians) happens such that the separation is lambda/2. When combined with the optical path difference of the coating, there is clearly destructive interference. Only applies to some wavelengths of light.
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Remember OPD + phase diff. relationship
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Travelling wave
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Waves that transfer energy from one point to another with no net mass transfer.
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Water waves and buoys.
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Plane polarization
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When an unpolarized wave is reduced to oscillations in just one plane (e.g. y --> x vertical plane)
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Transverse waves with multiple oscillations of the electric field and magnetic induction.
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