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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

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

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