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                                    Define the following terms in the context of spherical mirrors : Pole, centre of curvature, principal axis, and principal focus. | 
                            
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Answer» Solution :Pole - The CENTRE of reflecting surface of a spherical mirror is called its pole (P).  Centre of curvature - Centre of curvature of a spherical mirror is the centre of the sphere the given mirror is a part of which. Principal axis - Principal axis of a spherical mirror is a straight line passing through its pole and centre of curvature. Principal FOCUS - Principal focus of a spherical mirror is a POINT on its principal axis where light rays coming parallel to its principal axis, after reflection, actually converges to or appears to diverge from.  | 
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