Question

What does focal length mean?♥️

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Answer 1

Answer:

The focal length of an optical system is a measure of how strongly the system converges or diverges light.

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Answer 2

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.