how can we call the line that jions the center of curvsture and pde
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....Radius of curvature is the linear distance between the pole and the centre of curvature. .....#
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The diameter of the circular rim of the mirror, is called the aperture of the mirror. ... Principle Axis: The straight line passing through the pole P and the centre of curvature C of the mirror, is called principal axis of the mirror
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