Difference between Normal phase HPLC Column & Reverse phase HPLC Column?

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Difference between Normal phase HPLC Column & Reverse phase HPLC Column ?

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In normal phase stationary phase (column) is polar and mobile phase is non polar…
While in reverse phase stationary phase is non polar and mobile phase is polar…

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Have they any physically different ? So that we identify easaly Normal & Reverse phase Column.