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    Coherent Light Beams

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    If two light beams are coherent, which of the following is NOT necessary?

    a. they must have the same velocity
    b. they must have a constant phase differnce at every point in space
    c. they must have the same frequency
    d. they must have the same wavelength
    e. they must have the same amplitude

    © BrainMass Inc. brainmass.com October 9, 2019, 4:47 pm ad1c9bdddf
    https://brainmass.com/physics/light-vision-optics/coherent-light-beams-41131

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    Coherent light is that of the same frequency and have a constant ...

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