what is focal length ???
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Focal length :-- > it is of mirror as well as and lens and defined as the distance between pole and focus .
the infinite ray when passes through apperture of mirror or lens it diverge or converge through lens/mirror at focus and the the distance between apperture and focus called focal length .
it's si unit is diopeter denoted by D
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Explanation:
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.
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