The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.
In optics, the f-number of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography.
The numerical value of f-number in Chaldean Numerology is: 5
The numerical value of f-number in Pythagorean Numerology is: 7
Sample Sentences & Example Usage
There are worse things than getting a call for the wrong number at 4 AM. It could be the right number.
There's a number that's enough and there's a number that's not enough, the $20 million number is enough.
Politics is about the control of a limited number of resources by a limited number of people who think that number is too many
Number one: we want Lidl to get stronger in existing markets. Number two: we will expand to new countries. Number three: we will fundamentally overhaul Kaufland.
I am not judged by the number of times I fail, but by the number of times I succeed and the number of times I succeed is in direct proportion to the number of times I can fail and keep on trying.
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