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A certain person's eye measures 26 mm from the pupil to retina. If we treat the...

A certain person's eye measures 26 mm from the pupil to retina. If we treat the eye's lens as a thin lens, what is its focal length, in cm, when the person focuses on a pencil 43.3 cm from the eye? While the person focuses on the pencil, what is the image distance for a wall 348 cm from the eye?

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