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===About the Normal===
: A '''normal''' line is drawn on [[Ray Diagram|ray diagrams]] when a [[Light Ray|ray]] reaches the [[Interface|boundary]] between two [[Medium|media]].
: The [[Normal Contact Force|normal contact force]] is a [[force]] which always acts [[perpendicular]] to the boundary between two surfaces.
: [[Pressure]] is due to a [[force]] which is [[perpendicular]] to the surface of an [[object]].