Question

what do you mean by focus and focal length of a lens​

Answer 1

Answer:

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Focal length is the distance between the principal focal point and the optical centre of the lens (located on the optical axis and in the "middle of the lens). More focal points could be found on the focus plane, a plane passing through the principal

focus point and perpendicular to optical axis.

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Answer 2

Answer:

Explanation: In physic the focal length means the distance between the principal focus and the optical center of lens is called the focal length of a lens