What must the focal length of this lens

Reference no: EM13688435

Here is the question which I am struggling on, please help me!

Question: A person's eye lens is 2.7 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?

I need help for the above question and the clue here is that the retina distance is a positive distance of the image.

Reference no: EM13688435

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