Question

what is mean by focal length?

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Answer 1

Answer:

the distance between the centre of a mirror or a lens and its focus

Explanation:

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Answer 2

Answer:

The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.