The distance of the principal focus from the optical centre of a lens is called 1)Principal focus
2)optical centre
3)focal length ಸ
4)center of curvature
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The distance between the optic centre and the principal focus among principal focus, focal lengths, the radius of curvature and the principal axis is called focal length.
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3)focal length
The distance between the principal focus and the optical centre of the lens is its focal length
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