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Pole of a mirror

the focal len...

Question

the focal length and the center of curvature(2f) of a lens are measured from the optical center or the curved surface?

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Solution

Ans: All the distances such as:
* Focal length(f)
* Radius of curvature(r/2f)
* Distance of object from lens(u)
* Distance of image from lens(v)
are always measured from the optical canter of the lens, not from the surface.

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