Physics
Explain the following terms:
(a) Pole
(b) Centre of curvature
(c) Radius of curvature
(d) Principal axis
Show them on separate diagrams for each of the concave and convex mirrors.
Reflection of Light
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Answer
(a) Pole — The geometric centre of the spherical surface of the mirror is called the pole of the mirror. It is represented by the symbol P.
(b) Centre of curvature — The centre of curvature of a mirror is the centre of the sphere of which the mirror is a part. It is represented by the symbol C.
(c) Radius of curvature — The radius of curvature of a mirror is the radius of the sphere of which the mirror is a part. It is represented by symbol R.
(d) Principal axis — It is a straight line joining the pole of the mirror to its centre of curvature.
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