define the following terms related to spherical mirrors with one ray diagram
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Pole: The middle point of the reflecting surface of a spherical mirror is called pole.
The letter P represents pole, MP = M’P.
Centre of curvature: It is the centre of the sphere of glass of which the mirror is a part. The letter C represents the centre of curvature.
Principal axis of a spherical mirror is the straight line joining the centre of curvature and pole of the mirror.
Principal focus: The mid-point of CP is called focus (F). It is the point on the principal axis of a spherical mirror where all incident rays parallel to the principal axis meet or appear to diverge after reflection.
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