Tell me about principle focus and centre of curvature
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The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from concave mirror.
The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.
Centre of curvature of spherical mirror is the hollow sphere of glass of which the mirror is a part.