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प्रश्न
Two sources are called coherent if they produce waves ______________ .
विकल्प
of equal wavelength
of equal velocity
having same shape of wave front
having a constant phase difference
उत्तर
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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