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Question
Two sources are called coherent if they produce waves ______________ .
Options
of equal wavelength
of equal velocity
having same shape of wave front
having a constant phase difference
Solution
having a constant phase difference
For light waves emitted by two sources of light to remain coherent, the initial phase difference between waves should remain constant in time. If the phase difference changes continuously or randomly with time, then the sources are incoherent.
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