The person whose near-point distance is 39 cm wears a pair of glasses which are 2.0 cm from her eyes. With the help of these glasses, she can now focus on objects 25 cm away from the eyes. Determine the focal length and refractive power of the glasses.
i) 16 cm; 6.3 diopters
ii) 61 cm; 1.6 diopters
iii) 85 cm; 1.2 diopters