Focus - The point on the principal axis at which the incident rays which are parallel to the principal axis, meet after reflection from the mirror is called focus. Focal length - The distance between focus and pole is focal length. Video transcript.
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. Wikipedia
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Focus - The point on the principal axis at which the incident rays which are parallel to the principal axis, meet after reflection from the mirror is called focus. Focal length - The distance between focus and pole is focal length. Video transcript.
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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. Wikipedia