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1) The distance from the lens to the retina is 3.1 cm, what is the effective...

1) The distance from the lens to the retina is 3.1 cm, what is the effective focal length of the lens when staring at an object infinitely far away?

2) An object is moved to 40cm from the eye. What must the focal length of the eye be to focus the image on the retina?

3) In the near sighted eye, images focus before hitting the retina. Suppose the focal length of the lens is 1.9 cm, while the distance to the retina is still 3.1cm. What type of lens (converging or diverging) and what focal length should be used to correct this? The lens will be placed 1cm in front of the eye and we wish to see an object infinitely far away.

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