The distance of principal focus from the optical Centre of a lens is called the [[1]] of the lens.

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Detailed Solution

The distance of principal focus from the optical Centre of a lens is called the focal length of the lens.
The principal focus is the point on the principal axis where all the rays parallel to the principal axis meet after refraction from the lens.
The optical centre is the central point that lies on the principal axis through which a ray of light passes without suffering any deviations. In the given diagram focal point, focal length, and optical centre are illustrated.
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