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If you are asking about the f numbers of camera lenses. This dimensionless number is the ratio of the focal length over the diameter of the lens opening.
In other words, the ratio of the distance from the (optical) centre of the lens to the film plane, divided by the opening of the iris in the lens.
Typically this number will be in the low numbers - 3.5 or 6.3 etc. But there is no reason why this number can be a fractional number, such as 0.8 or 0.6.
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