Explain the terms for a convex lens : Focal length - Vidyadip

Question

Explain the terms for a convex lens : Focal length

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Answer

The distance of the principal focus from the optical centre of a lens is called the focal length $f$ of the lens.
[Distance between $O$ and $F_1$ is called focal length $f_1$ and distance between $O$ and $F_2$ is called focal length $f_2$)

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