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If a typical eyeball is 2.00 cm long and has a pupil opening that can range from about 2.00 mm to 6.00 mm, what are (a) the focal length of the eye when it is focused on objects 1.00 $\mathrm{m}$ away, (b) the smallest $f$ -number of the eye when it is focused on objects 1.00 $\mathrm{m}$ away, and $(\mathrm{c})$ the largest $f-$ number of the eye when it is focused on objects 1.00 $\mathrm{m}$ away?

a. f=0.0196 m

b. 3.27

c. 9.80

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