Question

what is focal length. ​

Answer 1

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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.

Answer 2

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• What is focal length ?

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• The focal length is the distance from the center of the lens to the principal focal point of the lens .

• The SI unit of focal length is metre .