Definition of focal length

1.	Definition of focal length
Answer» 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: The focal length of the LENS is the distance between the lens and the image sensor when the subject is in FOCUS, USUALLY stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm).

Answer»

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:

The focal length of the LENS is the distance between the lens and the image sensor when the subject is in FOCUS, USUALLY stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm).

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Definition of focal length​

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Definition of focal length