Answer :


(a) Centre of curvature: center of the hollow sphere of glass of which the mirror is a part.


(b) Radius of curvature: radius of the hollow sphere of glass of which the mirror is a part.


(c) Pole: The centre of a spherical mirror is called its pole.


(d) Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.


(e) Aperture: The portion of a mirror from which the reflection of light actually takes place is called the aperture of the mirror.


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