explain the following terms:
Pole, centre of curvature, radius of curvature and principal axis.
show them on separate diagrams for each of the concave and convex Mirrors .
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Pole - The geometric centre of the mirror is called pole.
The mid point of aperture AB is P, P is the pole of the mirror.
Centre of curvature - It is the centre of the hollow sphere which the mirror forms a part. It is represented by C.
Radius of curvature - It is the radius of the hollow sphere of which the mirror is a part. It is represented by R.
Principal axis - It is a straight line joining the pole of the mirror to its centre of curvature and extended further.
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