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Why is max focal length said to be u/4. (Object distance)

Why is max focal length said to be u/4. (Object distance)

Grade:12

1 Answers

Vikas TU
14149 Points
6 years ago
As we realize that 
Max central length is said to b u/4 
From the focal point equation , we can presume that central length is most extreme when the protest is put at four times the central length.

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