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- Dictionaryfocal length
noun
- 1. the distance between the centre of a lens or curved mirror and its focus.
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noun
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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. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter dis... Wikipedia