Graph Plotting: Determine u & v When Given 1/u & 1/v

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To plot a graph of 1/u against 1/v, the intercept on the 1/u axis can be used to determine values for u and v. When v is set to 27 cm, the corresponding value of u can be calculated from the graph. Conversely, when u is 27 cm, the value of v can also be derived from the graph. Some participants express confusion about locating specific values like 27 cm on the graph. The discussion emphasizes the importance of understanding the relationship between u and v through their reciprocals.
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Plot a graph of 1/u against 1/v and find the intercept on the 1/u axis.

Determine from your graph

a) the value of u, when v= 27cm
b) the value of v,when u 27cm

I'm sorry but I don't really understand how to find 27cm on my graph when there's nothing like that on it.
 
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Nevermind I'm stupid =.= just do 1/27
 
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