What is mean by Focal Length ?
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Answer:
Focal length is the distance between the centre of a mirror or a lens and its focus.
Explanation:
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Answered by
2
Answer:
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.
Explanation:
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