Which,if Any,of the Following Conditions Is Not Necessary for the Light

question 74

Multiple Choice

Which,if any,of the following conditions is not necessary for the light waves from two sources to be coherent?

• A)They must have the same frequency.
• B)They must have the same amplitude.
• C)They must have the same wavelength.
• D)They must have a constant phase difference.
• E)All of these conditions are necessary.

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