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An amateur photographer purchases a vintage camera at a flea market. In order to determine the focal length of the camera's lens, he sets a soup can at various distances from the camera At each distance he brings the camera into focus on the can and then carefully measures the distance between the lens and the film. His measurements are given in the table
Can distance (cm) | Lens distance (mm) |
25 | 118 |
35 | 104 |
50 | 95 |
75 | 89 |
100 | 87 |
Make a plot of the inverse lens distance as a function of the inverse can distance. Using a linear “best fit’ to the data, determine the focal length of the lens.
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