The imaginary line passing through the pole and the centre of curvatur

1.	The imaginary line passing through the pole and the centre of curvature is called the _______
Answer» The imaginary LINE passing through the pole and the center of curvature of the CURVED MIRROR is called its PRINCIPAL AXIS.

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The imaginary line passing through the pole and the centre of curvature is called the _______​

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The imaginary line passing through the pole and the centre of curvature is called the _______