what is 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.
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Focal length
The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length.
It is the point where parallel rays of light meet or converge.
The focal length varies with the sign (positive or negative) depending upon the nature of the lens and mirror(concave or convex).
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