what is the focal length of a lens
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It is the focal length of the lens which is the distance between the lens and the image sensor when the subject is in focus
It is the focal length of the lens which is the distance between the lens and the image sensor when the subject is in focus
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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.
Definition: Focal length. Focal length. Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.
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