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A convention is a set of agreed, stipulated, or generally accepted norms. It typically helps common efficiency or understanding but is not required, as opposed to a strict standard or protocol.

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Issue on sign convention with optics

With these conventions, you can rather easily solve for the focal length: $\frac{1}{o_1} + \frac{1}{o_2} = \frac{1}{f}$, $\left[\frac{1}{0.365}+\frac{1}{.117}\right]^{-1} = f$, and we know that the …
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