Does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely?

1. The focal length of the human eye is approximately 1.7 cm a) What is the f-number for

the human eye in bright light, when the pupil diameter is 2.0 mm? b? What is the

f- number in dim light, when the pupil diameter has expanded to 7.0 mm?

2. The focal length of a relaxed human eye is approximately 1.7 cm. When we focus our

eyes on a close-up object, we can change the refractive power of the eye by about 16

diopters. a) Does the refractive power of our eyes increase or decrease by 16 diopters

when we focus closely? Explain. b) Calculate the focal length of the eye when focus

closely.

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Explanation:

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