Question

what is focal length​

Answer 1

Answer:

Focal length is the distance from a lens to the point where parallel light rays will converge to a point. The lens is said to be focused on infinity at that point.

Explanation:

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Answer 2

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• What is focal length ?

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• The focal length is the distance from the center of the lens to the principal focal point of the lens .

• The SI unit of focal length is metre .