Question

what is focal length​

Answer 1

Answer:

The length between the focal point and optical center is known as focal length.

Explanation:

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Answer 2

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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 a system diverges light.

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