The average human eye is 1.7 cm in diameter. For a person with perfect vision, what...
The average human eye is 1.7 cm in diameter. For a
person with perfect vision, what is the focal length of the lens in
their eye when looking at an object that is an infinite distance
away?
f =
Homework Answers
Considering the lens to be at the retina, the image needs to be formed at the back of the eye to percieve the object.
So, for an object at infinity, the image must be at the end of the diameter of the eye. Hence, image distance is v=1.7 cm
For an object distance u, image distance v, lens equation is given by
f is the focal length of the lens
We have,
Putting the values,
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