Question

what is the focal length​

Answer 1

Answer:

The focal length is about how strongly the optical system is able to converge or diverge light that is coming towards it. The focal length is the distance between the optic center and the focus

Step-by-step explanation:

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Answer 2

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$\textit{The focal length of an optical system is a}$$\textit{measure of how strongly the system converges}$$\textit{or diverges light; it is the inverse of the system's}$..

$\textit{A positive focal length indicates that a system converges light}$ $\textit{while a negative focal length indicates that the system diverges light. }$