Question

what is focal length ??​

Answer 1

• 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.
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Answer 2

$\huge \underline \mathsf \red {AnswEr:-}$

• The distance between the pole and focus of the mirror is called focal length.