Question

The distance between the centre of curvature and the pole of the lens on the principal axis is​

Answer 1

Answer:

The distance from the pole to the center of curvature is called (no surprise, I hope) the radius of curvature (r). The distance from the pole to the focal point is called the focal length (f).

Answer 2

Answer:

The distance between the principal focus and centre of curvature of a lens is called its radius of curvature.

Explanation:

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