A student attempts to determine the focal length of a mirror through graphical analysis. They make a series of observations by changing the position of an object and measuring the position of the corresponding focused image. When they graph their data to create a linear relationship, they obtain the following graph. The best value for the focal length of the mirror, in meters, to two significant digits is:

A student attempts to determine the focal length of a mirror through graphical analysis. They make a series of observations by changing the position of an object and measuring the position of the corresponding focused image. When they graph their data to create a linear relationship, they obtain the following graph. The best value for the focal length of the mirror, in meters, to two significant digits is:

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