Is focal lengthpositive ornegativein concave mirror

Ive looked on the internet a little yet suprisingly the ansers are not consistant. Some say convex focal length is negative, some say positive and ive seen some say it can be both? Appreciate any help here.

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Focal lengthof concave lensispositive ornegative

2015916 — The basic formula on how to calculate the lens focal length is as follows: FL = (Sensor size * WD) / FOV.

Negative focal lengthreal or virtual

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Focal lengthof convex mirrorispositive ornegative

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When is focal length negativein mirror

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