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Coherence, path difference and phase difference are really important subjects to consider when we look at the interference of waves and how this leads onto double slit and diffraction grating patterns (to see how these work please look at these videos: http://bit.ly/1GQ5yEi and http://bit.ly/1Fmf2Wc).
DEFINITION: COHERENT WAVES HAVE A CONSTANT PHASE DIFFERENCE
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Lewis
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