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Light is a wave, and can be expressed as
 
Light is a wave, and can be expressed as
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<math>\Psi = A \sin \omega t + d </math>
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<math>\Psi = A \sin ( \omega t + d ) </math>
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where A is the amplitude, <math>\omega</math> is the frequency, t is time, and d is the phase-shift.
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We have a sum of three waves, which can be expressed as
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<math>\Psi _
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* Add diagrams to this page
 
* Add diagrams to this page
 
* Calculate precise thickness terms
 
* Calculate precise thickness terms
* Compensate for interference and internal reflection
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* Compensate for interference and internal reflection</math>
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