Problem: An eye has a far point of 200 cm. What is the focal length of the contact lens that allows the eye to see objects clearly that are very far from the eye? Is the focal length positive or negative?Ans. f = positive or negative = 

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An eye has a far point of 200 cm. What is the focal length of the contact lens that allows the eye to see objects clearly that are very far from the eye? Is the focal length positive or negative?

Ans. f

positive or negative = 

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