he "n" layer refraction wave is faster than the direct wave, but at some distance it is slower than the "n + 1" layer refraction (hint: take a
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Demonstrate (with a formula) in the refraction time of the "n" layer refraction wave is faster than the direct wave, but at some distance it is slower than the "n + 1" layer refraction (hint: take a model/example)
Given figure as,
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