If ab is the wavefront at time t=0 and cd is the wavefront at time t=t – InterviewSolution

1.	If ab is the wavefront at time t=0 and cd is the wavefront at time t=t1. Find the direction of propagation of light.
Answer» If $a b$ is the wavefront at time $t = 0$ and $c d$ is the wavefront at time $t = t_{1}$ . Find the direction of propagation of light.

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