To observe a stationary interference pattern | vedclass

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(D) For a stationary interference pattern to be observed,the phase difference between the two waves must remain constant over time. This requires the

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Both $(B)$ and $(C)$

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(D) For a stationary interference pattern to be observed,the phase difference between the two waves must remain constant over time. This requires the waves to be coherent,which implies they must have the same frequency.However,the amplitudes and intensities of the two waves do not need to be equal for an interference pattern to form. If the amplitudes are equal,the minima will be perfectly dark (zero intensity). If the amplitudes are unequal,the minima will not be perfectly dark,but an interference pattern will still exist.Since intensity $I$ is proportional to the square of the amplitude $(I \propto A^2)$,having different amplitudes implies having different intensities. Therefore,neither equal amplitude nor equal intensity is a necessary condition for observing a stationary interference pattern.

To observe a stationary interference pattern formed by two light waves,it is not necessary that they must have :

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