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Figure given below shows four progressive waves $A, B, C$ and $D$ with their phases expressed with respect to the wave $A$ . It can be calculated from the figure that
  • Athe wave $C$ is ahead by a phase angle of $\pi /2$ and the wave $B$ lags behind by a phase angle of $\pi /2$
  • Bthe wave $C$ lags behind by a phase angle of $\pi /2$ and the wave $B$ ahead by a phase angle of $\pi /2$
  • Cthe wave $C$ is ahead by a phase angle of $\pi $ and the wave $B$ lags behind by a phase angle of $\pi $
  • Dthe wave $C$ lags behind by a phase angle of $\pi $ and the wave $B$ is ahead by a phase angle of $\pi $
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