In an experiment to measure1 the focal length f of a converging lens object distances u and corresponding image distance were measured and 1/u plotted against 1/v to obtain the graph illustrated. How would f be determined from this graph?

• A.f= the slope of the graph
• B.f= the intercept on the 1/u axis
• C.f =the intercept on the 1/v axis
• D.f = reciprocal of the slope
• E.f = reciprocal of the intercept on either axes