Define the terms pole, principal axis and center of curvature with reference to a spherical mirror.



  • Pole — The geometric centre of the spherical surface of mirror is called the pole of the mirror.
  • Principal axis — It is the straight line joining the pole of the mirror to it’s centre of curvature.
  • Centre of curvature — The centre of curvature of a mirror is the centre of sphere of which the mirror is a part.

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