What is the difference between propagation number(K) and wave number(k) described in Optics book written by hecht(adsbygoogle = window.adsbygoogle || []).push({});

He defined K=2π/λ and k=1/λ and both of them have the same units (i.e, meter inverse)

What does wave number of a Harmonic function tells about?

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# Harmonic waves

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