The equation of a straight line:
m is the slope and c is the y-intercept.
1/s' = -(1/s) + 1/f
Comparing the lens equation to the equation of a straight line:
(S is the object distance, S' is the image distance and f is the focal length of the mirror or lens)
When we choose 1/S as the x axis and 1/S' as the y axis... Then we make a linear fit. Show that the slope is -1. And if intercept is C, calculate f as function of C only.
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