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The equation below (2.9) is also a linear differential equation.

This equation also describes the wave phenomena.

So, why is this equation not considered as wave equation?

I have taken it from the optics book by Chapter two Eugene Hecht,5th edition ,Pearson.

This equation also describes the wave phenomena.

So, why is this equation not considered as wave equation?

I have taken it from the optics book by Chapter two Eugene Hecht,5th edition ,Pearson.

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