Question

How to calculate the focal length?

Answer 1

Answer:

the length equation says1/f 1/Do+di, where f is the local length of the lens do it the distance from the object to the lens and Di is the distance of the lens to the infocus project image

Explanation:

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Answer 2

Explanation:

The lens equation says 1/f = 1/Do + 1/Di, where f is the focal length of the lens, Do is the distance from the object to the lens and Di is the distance from the lens to the in-focus projected image.

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