The focal length of the human eye is approximately 1.7cm.
Part A
What is thef-number for the human eye in bright light, when the pupil diameter is2.5mm?
f_{rm number}= __________
Part B
What is thef-number in dim light, when the pupil diameter has expanded to7.0mm?
f_{rm number}= __________
Express your answers using two significant figures.
