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

Akash , 8 Years ago
Grade 12
anser 1 Answers
Vikas TU
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.
Last Activity: 8 Years ago
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