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If a nearsighted person has a far point dfd_f that is 3.50mm from the eye, what is the focal length f1f_1 of the contact lenses that the person would need to see an object at infinity clearly? Express your answer in meters.
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a nearsighted person has a far point  that is q = -3.50 m

the lens equation is

1/f = 1/p + 1/q    ( here in thiscase p = ? object at infinity)

so 1/f = 1/? +1/-3.50m

so f = -3.5m
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