Neha Kakkar song
Aasman ma badal .
what is mean by 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.
Explanation:
f=-\frac{R}{2}
f = focal length
{R} = radius of curvature of the mirror's surface
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