CBSE Class 12-science Answered
a. Pole : Pole of a spherical refracting surface is the centre of the surface.
b. Centre of curvature: Centre of curvature of a refracting surface is the centre of the sphere of which this surface is a part.
c.Principle axis: The line passing through the pole and centre of curvature of spherical refracting surface, extended on either side is called the principle axis of the surface.
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