The distance between the optic centre and the principal focus is called
a) principal focus b) focal lengthc) radius of curvature d) principal axis
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hi.. the ans is focal length
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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.
The principal focus is the point on the principal axis where all the rays pass through after refracting from the lens when the rays are travelling parallel to the principal axis.
While the optical centre is the point on the principal axis from where the rays pass through without being deflected.
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