Meaning of 'FOCAL LENGTH' ↑↑↑↑↑↑↑↑↑↑↑↑↑
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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. Wikipedia
Formula
f=-\frac{R}{2}
f = focal length
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Answer:
the distance of a focus from the surface of a lens or curved mirror.
Explanation:
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