Pupil Size When the brightness x of a light source isincreased, the eye reacts by

Chapter 2, Problem 82

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Pupil Size When the brightness x of a light source isincreased, the eye reacts by decreasing the radius R of thepupil. The dependence of R on x is given by the functionR1x2 13 7x0.41 4x0.4 where R is measured in millimeters and x is measured inappropriate units of brightness.(a) Find R112, R1102 , and R11002 .(b) Make a table of values of R1x2 .(c) Find the net change in the radius R as x changes from10 to 100.

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