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a) Principle axis is a straight line passing through the centre of curvature and the pole.
b) The centre of curvature is the centre of the sphere of which the mirror is part.
c) Principal focus is the point at which all rays that are parallel and close to the principle axis converge or appear to diverge after reflection.
chrispohmomanyi answered the question on September 16, 2017 at 18:30
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