3 solutions of a dye are measured at 459 him with a spectrophotometer using a 1 . 2 2 cm cuvette .

1) How can I find the extinction coefficient? (Is the best way to plot the points?)
2) How do I calculate whether the spectrophotometer can be used to distinguish between a solution of 8.219 x 10^-6M and 8.579 x 10^-6M dye?
3 solutions of a dye are measured at 459 him with a spectrophotometer using a 1 . 2 2 cm cuvette .AbsorbanceConcentration0 . 328.219 X 10- 6 M0. 872 . 235 X 10 – 5 M2.51. 1 17 X 10 – 4 M