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why we are use at the time of focus distance calculation we take the sign + for convex and – for concave.who discoved first and why that take +,- ?

why we are use at the time of focus distance calculation we take the sign + for convex and – for concave.who discoved first and why that take +,- ?

Grade:12th pass

1 Answers

Saurabh Koranglekar
askIITians Faculty 10336 Points
2 years ago

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