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Joe first focuses his attention (and his eyes on the tree. the focal length of the cornea-lens system in his eye must be __________ the distance between the front and back of his eye.

User Janez
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As Joe first focuses his attention and his eyes on the tree, he needs to know that the focal length of the cornea lens system in his eyes must be less than the distance between the front and the back of his eye.
User One Two Three
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