1. The problem statement, all variables and given/known data Without her contact lenses, Kat cannot clearly see an object more than 70.0cm away. What should be the focal length of her corrective contact lenses? 2. Relevant equations 1/f = 1/p + 1/q 3. The attempt at a solution 1/f = 1/infinity + 1/-70.0cm = -0.0143cm f = -70.0 cm Would anyone be able to please check this answer? Thank you!