Physcis  Wavefront and wavelets
posted by Farah .
Describe how the wavelets that form in the wavefront apparently vanish behind it?

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Actually to explain the energy propagated by a wave , ther is a proposed obliqiuty factor ,1+cos(theta)=q .
In the case when the backward wavefront is taken the angle becomes 180degrees and as a result q= 0 , it means no energy propagation in the backward direction.
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