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If D is fewer than zero, the medium is alleged to own optimistic dispersion or typical dispersion. If D is bigger than zero, the medium has damaging dispersion. If a light pulse is propagated by way of a Usually dispersive medium, the result is the upper frequency components slow down https://powerline04311.getblogs.net/62369826/5-tips-about-best-surround-sound-system-you-can-use-today

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